diff --git a/api/cases/celery_tasks.py b/api/cases/celery_tasks.py
index a667619f0d..19fb68b174 100644
--- a/api/cases/celery_tasks.py
+++ b/api/cases/celery_tasks.py
@@ -172,7 +172,7 @@ def schedule_all_ecju_query_chaser_emails():
     """
     Sends an ECJU 15 working days reminder
     Runs as a background task daily at a given time.
-    Doesn't run on non-working days (bank-holidays & weekends)
+    Can accommodate reruns and can send reminders if any have been missed upto 20 days after ECJU Query created
     """
     logger.info("Sending all ECJU query chaser emails started")
 
diff --git a/api/cases/tests/test_case_ecju_queries.py b/api/cases/tests/test_case_ecju_queries.py
index bee95f36cf..22b763e952 100644
--- a/api/cases/tests/test_case_ecju_queries.py
+++ b/api/cases/tests/test_case_ecju_queries.py
@@ -1,4 +1,4 @@
-from api.conf import settings
+from django.conf import settings
 import pytest
 import datetime
 from unittest import mock
@@ -692,6 +692,10 @@ class ECJUQueriesChaserNotificationTests(DataTestClient):
     def setUp(self):
         super().setUp()
         settings.GOV_NOTIFY_ENABLED = True
+        # Require a valid formatted key else NotificationsAPIClient will complain with missing service id key.
+        settings.GOV_NOTIFY_KEY = (
+            "faketestkey-aa1539a1-0ba4-4ac2-b6ff-ae557aed2169-aa1539a1-0ba4-4ac2-b6ff-ae557aed2169"
+        )
         self.case = self.create_standard_application_case(self.organisation)
         self.date_15_working_days_from_today = datetime.datetime(2024, 1, 16, 12, 00)
 
diff --git a/api/conf/celery.py b/api/conf/celery.py
index 286d5769d1..c9e88ce463 100644
--- a/api/conf/celery.py
+++ b/api/conf/celery.py
@@ -29,6 +29,6 @@
     },
     "send ecju query chaser emails 8pm, 4pm": {
         "task": "api.cases.celery_tasks.schedule_all_ecju_query_chaser_emails",
-        "schedule": crontab(hour="8, 16", minute=0),
+        "schedule": crontab(hour="8, 12, 13, 15 ,16", minute=0),
     },
 }