diff --git a/enterprise/app/models/captain/lifecycle/delivery.rb b/enterprise/app/models/captain/lifecycle/delivery.rb
index 15582a276..db1a1e772 100644
--- a/enterprise/app/models/captain/lifecycle/delivery.rb
+++ b/enterprise/app/models/captain/lifecycle/delivery.rb
@@ -6,7 +6,7 @@ class Captain::Lifecycle::Delivery < ApplicationRecord
   belongs_to :account
   belongs_to :lifecycle_rule, class_name: 'Captain::Lifecycle::Rule', optional: true
   belongs_to :captain_reservation, class_name: 'Captain::Reservation'
-  belongs_to :conversation, optional: true
+  belongs_to :conversation, class_name: '::Conversation', optional: true
   belongs_to :message, optional: true
   belongs_to :inbox, optional: true
 
diff --git a/enterprise/app/services/captain/lifecycle/guards/customer_replied.rb b/enterprise/app/services/captain/lifecycle/guards/customer_replied.rb
new file mode 100644
index 000000000..fb5aeafcd
--- /dev/null
+++ b/enterprise/app/services/captain/lifecycle/guards/customer_replied.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+class Captain::Lifecycle::Guards::CustomerReplied < Captain::Lifecycle::Guards::Base
+  MAX_DELAY = 2.hours
+
+  def check
+    config = Captain::Lifecycle::Config.for_account(@account)
+    return pass unless config.pause_on_customer_reply
+
+    window = config.pause_on_customer_reply_within_minutes.to_i.minutes
+    conversation = resolve_conversation
+    return pass if conversation.blank?
+
+    last_incoming_at = last_incoming_message_at(conversation)
+    return pass if last_incoming_at.blank?
+
+    wait_until = last_incoming_at + window
+    return pass if @delivery.fire_at >= wait_until
+
+    delay = wait_until - @delivery.fire_at
+    return skip('too_stale') if delay > MAX_DELAY
+
+    reschedule(wait_until)
+  end
+
+  private
+
+  def last_incoming_message_at(conversation)
+    conversation.messages
+                .where(message_type: Message.message_types[:incoming])
+                .maximum(:created_at)
+  end
+
+  def resolve_conversation
+    return @delivery.conversation if @delivery.conversation.present?
+
+    inbox_id = @delivery.inbox_id || @reservation.unit&.concierge_inbox_id
+    return nil if inbox_id.blank?
+
+    @account.conversations
+            .where(contact_id: @reservation.contact_id, inbox_id: inbox_id)
+            .order(last_activity_at: :desc)
+            .first
+  end
+end
diff --git a/enterprise/app/services/captain/lifecycle/guards/min_interval.rb b/enterprise/app/services/captain/lifecycle/guards/min_interval.rb
new file mode 100644
index 000000000..d9debf8f7
--- /dev/null
+++ b/enterprise/app/services/captain/lifecycle/guards/min_interval.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+class Captain::Lifecycle::Guards::MinInterval < Captain::Lifecycle::Guards::Base
+  MAX_DELAY = 2.hours
+
+  def check
+    config = Captain::Lifecycle::Config.for_account(@account)
+    interval = config.min_interval_minutes.to_i
+    return pass if interval <= 0
+
+    last_sent_at = last_sent_delivery_at
+    return pass if last_sent_at.blank?
+
+    earliest_allowed = last_sent_at + interval.minutes
+    return pass if @delivery.fire_at >= earliest_allowed
+
+    delay = earliest_allowed - @delivery.fire_at
+    return skip('too_stale') if delay > MAX_DELAY
+
+    reschedule(earliest_allowed)
+  end
+
+  private
+
+  def last_sent_delivery_at
+    Captain::Lifecycle::Delivery
+      .where(captain_reservation_id: @reservation.id,
+             status: 'sent',
+             origin: 'scheduled_lifecycle')
+      .maximum(:sent_at)
+  end
+end
diff --git a/spec/enterprise/services/captain/lifecycle/guards/customer_replied_spec.rb b/spec/enterprise/services/captain/lifecycle/guards/customer_replied_spec.rb
new file mode 100644
index 000000000..b532ffe81
--- /dev/null
+++ b/spec/enterprise/services/captain/lifecycle/guards/customer_replied_spec.rb
@@ -0,0 +1,118 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Captain::Lifecycle::Guards::CustomerReplied do
+  subject(:guard) { described_class.new(delivery) }
+
+  let(:account) { create(:account) }
+  let(:contact) { create(:contact, account: account) }
+  let(:inbox) { create(:inbox, account: account) }
+  let(:reservation) { create(:captain_reservation, account: account, contact: contact, inbox: inbox) }
+  let(:conversation) { create(:conversation, account: account, contact: contact, inbox: inbox) }
+  let(:delivery) do
+    d = create(:captain_lifecycle_delivery,
+               account: account, captain_reservation: reservation,
+               inbox: inbox,
+               fire_at: 1.minute.from_now)
+    d.update!(conversation_id: conversation.id)
+    d
+  end
+
+  context 'when guard is disabled' do
+    before { create(:captain_lifecycle_config, account: account, pause_on_customer_reply: false) }
+
+    it 'passes' do
+      expect(guard.check).to eq(action: :pass)
+    end
+  end
+
+  context 'when guard is enabled with 60 min window' do
+    before do
+      create(:captain_lifecycle_config,
+             account: account, pause_on_customer_reply: true, pause_on_customer_reply_within_minutes: 60)
+    end
+
+    it 'passes when no incoming messages exist' do
+      expect(guard.check).to eq(action: :pass)
+    end
+
+    it 'reschedules when customer sent a message 10min ago' do
+      create(:message,
+             account: account, conversation: conversation, inbox: inbox,
+             message_type: 'incoming', content: 'Olá', sender: contact,
+             created_at: 10.minutes.ago)
+
+      result = guard.check
+      expect(result[:action]).to eq(:reschedule)
+      expect(result[:fire_at]).to be_within(1.minute).of(10.minutes.ago + 60.minutes)
+    end
+
+    it 'passes when the only messages are outgoing' do
+      agent = create(:user, account: account)
+      create(:message,
+             account: account, conversation: conversation, inbox: inbox,
+             message_type: 'outgoing', content: 'Respondendo', sender: agent,
+             created_at: 5.minutes.ago)
+
+      expect(guard.check).to eq(action: :pass)
+    end
+
+    it 'skips too_stale when customer replied more than 2h + window ago' do
+      # fire_at = 1 min from now; last_incoming = 3h ago; wait_until = 3h ago + 60min = 2h ago
+      # wait_until < fire_at → pass
+      create(:message,
+             account: account, conversation: conversation, inbox: inbox,
+             message_type: 'incoming', content: 'Mensagem antiga', sender: contact,
+             created_at: 3.hours.ago)
+
+      expect(guard.check).to eq(action: :pass)
+    end
+
+    it 'skips too_stale when delay exceeds MAX_DELAY' do
+      past_delivery = create(:captain_lifecycle_delivery,
+                             account: account, captain_reservation: reservation,
+                             inbox: inbox,
+                             fire_at: 3.hours.ago)
+      past_delivery.update!(conversation_id: conversation.id)
+      past_guard = described_class.new(past_delivery)
+
+      # last incoming = 10min ago; window = 60min; wait_until = 50min from now
+      # fire_at = 3h ago; delay = wait_until - fire_at ≈ 3h50m > 2h → too_stale
+      create(:message,
+             account: account, conversation: conversation, inbox: inbox,
+             message_type: 'incoming', content: 'Mensagem recente', sender: contact,
+             created_at: 10.minutes.ago)
+
+      result = past_guard.check
+      expect(result[:action]).to eq(:skip)
+      expect(result[:reason]).to eq('too_stale')
+    end
+  end
+
+  context 'when delivery has no conversation but delivery has inbox_id' do
+    subject(:guard_no_conv) { described_class.new(delivery_without_conv) }
+
+    before do
+      create(:captain_lifecycle_config,
+             account: account, pause_on_customer_reply: true, pause_on_customer_reply_within_minutes: 60)
+    end
+
+    let(:delivery_without_conv) do
+      create(:captain_lifecycle_delivery,
+             account: account, captain_reservation: reservation,
+             inbox: inbox,
+             fire_at: 1.minute.from_now)
+    end
+
+    it 'resolves conversation via inbox and contact' do
+      create(:message,
+             account: account, conversation: conversation, inbox: inbox,
+             message_type: 'incoming', content: 'Hey', sender: contact,
+             created_at: 5.minutes.ago)
+
+      result = guard_no_conv.check
+      expect(result[:action]).to eq(:reschedule)
+    end
+  end
+end
diff --git a/spec/enterprise/services/captain/lifecycle/guards/min_interval_spec.rb b/spec/enterprise/services/captain/lifecycle/guards/min_interval_spec.rb
new file mode 100644
index 000000000..1e18562ec
--- /dev/null
+++ b/spec/enterprise/services/captain/lifecycle/guards/min_interval_spec.rb
@@ -0,0 +1,80 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Captain::Lifecycle::Guards::MinInterval do
+  subject(:guard) { described_class.new(delivery) }
+
+  let(:account) { create(:account) }
+  let(:reservation) { create(:captain_reservation, account: account) }
+  let(:delivery) do
+    create(:captain_lifecycle_delivery,
+           account: account, captain_reservation: reservation, fire_at: 1.minute.from_now)
+  end
+
+  context 'when min_interval_minutes = 0' do
+    before { create(:captain_lifecycle_config, account: account, min_interval_minutes: 0) }
+
+    it 'passes' do
+      expect(guard.check).to eq(action: :pass)
+    end
+  end
+
+  context 'when min_interval_minutes = 30' do
+    before { create(:captain_lifecycle_config, account: account, min_interval_minutes: 30) }
+
+    it 'passes when no previous delivery was sent' do
+      expect(guard.check).to eq(action: :pass)
+    end
+
+    it 'reschedules when a previous delivery was sent < 30min ago' do
+      create(:captain_lifecycle_delivery,
+             account: account, captain_reservation: reservation,
+             status: 'sent', sent_at: 10.minutes.ago, origin: 'scheduled_lifecycle')
+
+      result = guard.check
+      expect(result[:action]).to eq(:reschedule)
+      expect(result[:fire_at]).to be_within(1.minute).of(10.minutes.ago + 30.minutes)
+    end
+
+    it 'skips with too_stale when rescheduled delay exceeds 2 hours' do
+      create(:captain_lifecycle_delivery,
+             account: account, captain_reservation: reservation,
+             status: 'sent', sent_at: 3.hours.ago, origin: 'scheduled_lifecycle')
+
+      # fire_at is 1 minute from now; earliest_allowed = 3.hours.ago + 30.min = ~2.5 hours ago
+      # earliest_allowed < fire_at → should pass
+      expect(guard.check).to eq(action: :pass)
+    end
+
+    it 'skips with too_stale when delay between earliest_allowed and fire_at exceeds MAX_DELAY' do
+      # fire_at = 1 min from now; last sent_at = 1 minute ago → earliest_allowed = 29 min from now
+      # delay = earliest_allowed - fire_at = ~28 min → reschedule
+      create(:captain_lifecycle_delivery,
+             account: account, captain_reservation: reservation,
+             status: 'sent', sent_at: 1.minute.ago, origin: 'scheduled_lifecycle')
+
+      result = guard.check
+      expect(result[:action]).to eq(:reschedule)
+    end
+
+    it 'skips too_stale when earliest_allowed is more than 2h after fire_at' do
+      # Make delivery fire_at in the past so earliest_allowed is far ahead
+      past_delivery = create(:captain_lifecycle_delivery,
+                             account: account, captain_reservation: reservation,
+                             fire_at: 3.hours.ago)
+
+      past_guard = described_class.new(past_delivery)
+
+      # sent 10min ago, interval 30min → earliest = 20min from now
+      # fire_at = 3h ago → delay = earliest - fire_at ≈ 3h20m > 2h → too_stale
+      create(:captain_lifecycle_delivery,
+             account: account, captain_reservation: reservation,
+             status: 'sent', sent_at: 10.minutes.ago, origin: 'scheduled_lifecycle')
+
+      result = past_guard.check
+      expect(result[:action]).to eq(:skip)
+      expect(result[:reason]).to eq('too_stale')
+    end
+  end
+end