diff --git a/app/main/views/broadcast.py b/app/main/views/broadcast.py
index e11a8fb30..052dc5399 100644
--- a/app/main/views/broadcast.py
+++ b/app/main/views/broadcast.py
@@ -449,14 +449,14 @@ def approve_broadcast_message(service_id, broadcast_message_id):
         ))
 
     if current_service.trial_mode:
-        broadcast_message.approve_broadcast()
+        broadcast_message.approve_broadcast(channel=current_service.broadcast_channel)
         return redirect(url_for(
             '.broadcast_tour',
             service_id=current_service.id,
             step_index=6,
         ))
     elif form.validate_on_submit():
-        broadcast_message.approve_broadcast()
+        broadcast_message.approve_broadcast(channel=current_service.broadcast_channel)
     else:
         return render_template(
             'views/broadcast/view-message.html',
diff --git a/app/models/broadcast_message.py b/app/models/broadcast_message.py
index a3ea36499..14c4c9525 100644
--- a/app/models/broadcast_message.py
+++ b/app/models/broadcast_message.py
@@ -248,12 +248,15 @@ class BroadcastMessage(JSONModel):
     def request_approval(self):
         self._set_status_to('pending-approval')
 
-    def approve_broadcast(self):
+    def approve_broadcast(self, channel):
+        if channel in {'test', 'operator'}:
+            ttl = timedelta(hours=4, minutes=0)
+        else:
+            ttl = timedelta(hours=22, minutes=30)
+
         self._update(
             starts_at=datetime.utcnow().isoformat(),
-            finishes_at=(
-                datetime.utcnow() + timedelta(hours=23, minutes=59)
-            ).isoformat(),
+            finishes_at=(datetime.utcnow() + ttl).isoformat(),
         )
         self._set_status_to('broadcasting')
 
diff --git a/tests/app/main/views/test_broadcast.py b/tests/app/main/views/test_broadcast.py
index 6e480f0c9..589bc9205 100644
--- a/tests/app/main/views/test_broadcast.py
+++ b/tests/app/main/views/test_broadcast.py
@@ -2375,6 +2375,16 @@ def test_user_without_approve_permission_cant_approve_broadcast_they_created(
     )
 
 
+@pytest.mark.parametrize('channel, expected_finishes_at', (
+    # 4 hours later
+    ('operator', '2020-02-23T02:22:22'),
+    ('test', '2020-02-23T02:22:22'),
+
+    # 22 hours 30 minutes later
+    ('severe', '2020-02-23T20:52:22'),
+    ('government', '2020-02-23T20:52:22'),
+    (None, '2020-02-23T20:52:22'),  # Training mode
+))
 @pytest.mark.parametrize(
     'trial_mode, initial_status, post_data, expected_approval, expected_redirect',
     (
@@ -2424,6 +2434,8 @@ def test_confirm_approve_broadcast(
     expected_approval,
     trial_mode,
     expected_redirect,
+    channel,
+    expected_finishes_at,
 ):
     mocker.patch(
         'app.broadcast_message_api_client.get_broadcast_message',
@@ -2438,6 +2450,7 @@ def test_confirm_approve_broadcast(
     )
     service_one['restricted'] = trial_mode
     service_one['permissions'] += ['broadcast']
+    service_one['broadcast_channel'] = channel
 
     client_request.login(active_user_approve_broadcasts_permission)
     client_request.post(
@@ -2457,7 +2470,7 @@ def test_confirm_approve_broadcast(
             broadcast_message_id=fake_uuid,
             data={
                 'starts_at': '2020-02-22T22:22:22',
-                'finishes_at': '2020-02-23T22:21:22',
+                'finishes_at': expected_finishes_at,
             },
         )
         mock_update_broadcast_message_status.assert_called_once_with(