diff --git a/app/celery/reporting_tasks.py b/app/celery/reporting_tasks.py
index d88c62deb..72ac2fd97 100644
--- a/app/celery/reporting_tasks.py
+++ b/app/celery/reporting_tasks.py
@@ -68,15 +68,23 @@ def create_nightly_billing_for_day(process_day):
 @cronitor("create-nightly-notification-status")
 @statsd(namespace="tasks")
 def create_nightly_notification_status():
-    day_start = convert_utc_to_bst(datetime.utcnow()).date() - timedelta(days=1)
+    yesterday = convert_utc_to_bst(datetime.utcnow()).date() - timedelta(days=1)
 
-    for i in range(0, 4):
-        process_day = day_start - timedelta(days=i)
-        for notification_type in [SMS_TYPE, EMAIL_TYPE, LETTER_TYPE]:
+    # email and sms
+    for i in range(4):
+        process_day = yesterday - timedelta(days=i)
+        for notification_type in [SMS_TYPE, EMAIL_TYPE]:
             create_nightly_notification_status_for_day.apply_async(
                 kwargs={'process_day': process_day.isoformat(), 'notification_type': notification_type},
                 queue=QueueNames.REPORTING
             )
+    # letters get modified for a longer time period than sms and email, so we need to reprocess for more days
+    for i in range(10):
+        process_day = yesterday - timedelta(days=i)
+        create_nightly_notification_status_for_day.apply_async(
+            kwargs={'process_day': process_day.isoformat(), 'notification_type': LETTER_TYPE},
+            queue=QueueNames.REPORTING
+        )
 
 
 @notify_celery.task(name="create-nightly-notification-status-for-day")
diff --git a/tests/app/celery/test_reporting_tasks.py b/tests/app/celery/test_reporting_tasks.py
index f6fb40a3b..c0fc69074 100644
--- a/tests/app/celery/test_reporting_tasks.py
+++ b/tests/app/celery/test_reporting_tasks.py
@@ -54,16 +54,27 @@ def test_create_nightly_notification_status_triggers_tasks_for_days(notify_api,
     mock_celery = mocker.patch('app.celery.reporting_tasks.create_nightly_notification_status_for_day')
     create_nightly_notification_status()
 
-    assert mock_celery.apply_async.call_count == 4 * 3  # four days, three notification types
+    assert mock_celery.apply_async.call_count == (
+        (4 * 3)  # four days, three notification types
+        +
+        6  # six more days of just letters
+    )
+
     for process_date, notification_type in itertools.product(
         ['2019-07-31', '2019-07-30', '2019-07-29', '2019-07-28'],
-        ['sms', 'email', 'letter']
+        [SMS_TYPE, EMAIL_TYPE, LETTER_TYPE]
     ):
         mock_celery.apply_async.assert_any_call(
             kwargs={'process_day': process_date, 'notification_type': notification_type},
             queue=QueueNames.REPORTING
         )
 
+    for process_date in ['2019-07-27', '2019-07-26', '2019-07-25', '2019-07-24', '2019-07-23', '2019-07-22']:
+        mock_celery.apply_async.assert_any_call(
+            kwargs={'process_day': process_date, 'notification_type': LETTER_TYPE},
+            queue=QueueNames.REPORTING
+        )
+
 
 @pytest.mark.parametrize('second_rate, records_num, billable_units, multiplier',
                          [(1.0, 1, 2, [1]),