diff --git a/engine/apps/alerts/tasks/notify_ical_schedule_shift.py b/engine/apps/alerts/tasks/notify_ical_schedule_shift.py
index 1a261880..a23f2a4b 100644
--- a/engine/apps/alerts/tasks/notify_ical_schedule_shift.py
+++ b/engine/apps/alerts/tasks/notify_ical_schedule_shift.py
@@ -308,7 +308,7 @@ def notify_ical_schedule_shift(schedule_pk):
         new_shifts = sorted(new_shifts, key=lambda shift: shift["start"])
 
         if len(new_shifts) != 0:
-            days_to_lookup = (new_shifts[-1]["end"].date() - now.date()).days
+            days_to_lookup = (new_shifts[-1]["end"].date() - now.date()).days + 1
             days_to_lookup = max([days_to_lookup, MIN_DAYS_TO_LOOKUP_FOR_THE_END_OF_EVENT])
         else:
             days_to_lookup = MIN_DAYS_TO_LOOKUP_FOR_THE_END_OF_EVENT
diff --git a/engine/apps/alerts/tests/test_notify_ical_schedule_shift.py b/engine/apps/alerts/tests/test_notify_ical_schedule_shift.py
index d6cb6398..eae19ef3 100644
--- a/engine/apps/alerts/tests/test_notify_ical_schedule_shift.py
+++ b/engine/apps/alerts/tests/test_notify_ical_schedule_shift.py
@@ -1,4 +1,9 @@
+from datetime import datetime
+from unittest.mock import Mock, patch
+
 import pytest
+import pytz
+from django.utils import timezone
 
 from apps.alerts.tasks.notify_ical_schedule_shift import notify_ical_schedule_shift
 from apps.schedules.models import OnCallScheduleICal
@@ -9,32 +14,35 @@ PRODID:-//Google Inc//Google Calendar 70.9054//EN
 VERSION:2.0
 CALSCALE:GREGORIAN
 METHOD:PUBLISH
-X-WR-CALNAME:t
-X-WR-TIMEZONE:Asia/Yekaterinburg
-BEGIN:VTIMEZONE
-TZID:Asia/Yekaterinburg
-X-LIC-LOCATION:Asia/Yekaterinburg
-BEGIN:STANDARD
-TZOFFSETFROM:+0500
-TZOFFSETTO:+0500
-TZNAME:+05
-DTSTART:19700101T000000
-END:STANDARD
-END:VTIMEZONE
 BEGIN:VEVENT
-DTSTART;TZID=Asia/Yekaterinburg:20210124T130000
-DTEND;TZID=Asia/Yekaterinburg:20210124T220000
-RRULE:FREQ=DAILY
-DTSTAMP:20210127T143634Z
-UID:0i0af8p6p8vfampe3r1vkog0jg@google.com
-CREATED:20210127T143553Z
+DTSTART;VALUE=DATE:20211005
+DTEND;VALUE=DATE:20211012
+RRULE:FREQ=WEEKLY;WKST=SU;INTERVAL=7;BYDAY=WE
+DTSTAMP:20210930T125523Z
+UID:id1@google.com
+CREATED:20210928T202349Z
 DESCRIPTION:
-LAST-MODIFIED:20210127T143553Z
+LAST-MODIFIED:20210929T204751Z
 LOCATION:
-SEQUENCE:0
+SEQUENCE:1
 STATUS:CONFIRMED
-SUMMARY:@Bernard Desruisseaux
-TRANSP:OPAQUE
+SUMMARY:user1
+TRANSP:TRANSPARENT
+END:VEVENT
+BEGIN:VEVENT
+DTSTART;VALUE=DATE:20210928
+DTEND;VALUE=DATE:20211005
+RRULE:FREQ=WEEKLY;WKST=SU;INTERVAL=7;BYDAY=WE
+DTSTAMP:20210930T125523Z
+UID:id2@google.com
+CREATED:20210928T202331Z
+DESCRIPTION:
+LAST-MODIFIED:20210929T204744Z
+LOCATION:
+SEQUENCE:2
+STATUS:CONFIRMED
+SUMMARY:user2
+TRANSP:TRANSPARENT
 END:VEVENT
 END:VCALENDAR
 """
@@ -61,3 +69,36 @@ def test_current_overrides_ical_schedule_is_none(
 
     # this should not raise
     notify_ical_schedule_shift(ical_schedule.oncallschedule_ptr_id)
+
+
+@pytest.mark.django_db
+def test_next_shift_notification_long_shifts(
+    make_organization_and_user_with_slack_identities,
+    make_schedule,
+    make_user,
+):
+    organization, _, _, _ = make_organization_and_user_with_slack_identities()
+    make_user(organization=organization, username="user1")
+    make_user(organization=organization, username="user2")
+
+    ical_schedule = make_schedule(
+        organization,
+        schedule_class=OnCallScheduleICal,
+        name="test_ical_schedule",
+        channel="channel",
+        ical_url_primary="url",
+        prev_ical_file_primary=ICAL_DATA,
+        cached_ical_file_primary=ICAL_DATA,
+        prev_ical_file_overrides=None,
+        cached_ical_file_overrides=None,
+    )
+
+    with patch.object(timezone, "datetime", Mock(wraps=timezone.datetime)) as mock_tz_datetime:
+        mock_tz_datetime.now.return_value = datetime(2021, 9, 29, 12, 0, tzinfo=pytz.UTC)
+        with patch("apps.slack.slack_client.SlackClientWithErrorHandling.api_call") as mock_slack_api_call:
+            notify_ical_schedule_shift(ical_schedule.oncallschedule_ptr_id)
+
+    slack_blocks = mock_slack_api_call.call_args_list[0][1]["blocks"]
+    notification = slack_blocks[0]["text"]["text"]
+    assert "*New on-call shift:*\nuser2" in notification
+    assert "*Next on-call shift:*\nuser1" in notification