Most often in July, 29 days.
Highest follower count seen that year: 965.
June
Jun 15 07:00–09:00, 12:00–15:00, 19:00–20:00 Jun 16 20:00–21:00 Jun 17 05:00–06:00 Jun 18 02:00–04:00, 12:00–14:00 Jun 19 04:00–06:00, 12:00–15:00 Jun 20 04:00–15:00, 20:00–21:00 Jun 21 04:00–09:00, 11:00–15:00 Jun 22 02:00–03:00, 06:00–07:00 Jun 23 17:00–20:00 Jun 24 04:00–05:00, 16:00–18:00, 20:00–21:00 Jun 25 04:00–06:00 Jun 26 02:00–04:00, 19:00–20:00 Jun 27 13:00–14:00 Jun 28 05:00–06:00, 21:00–24:00 Jun 29 00:00–01:00, 05:00–06:00, 13:00–15:00 Jun 30 00:00–03:00, 05:00–06:00, 16:00–22:00
July
Jul 1 04:00–06:00, 15:00–17:00 Jul 3 02:00–07:00, 19:00–20:00 Jul 4 03:00–04:00, 06:00–07:00, 11:00–18:00, 20:00–21:00 Jul 5 03:00–05:00 Jul 6 01:00–04:00 Jul 7 04:00–07:00, 15:00–22:00 Jul 8 05:00–07:00, 15:00–17:00 Jul 9 04:00–07:00, 16:00–17:00, 19:00–21:00 Jul 10 05:00–06:00, 16:00–17:00 Jul 11 03:00–06:00, 10:00–12:00, 15:00–18:00 Jul 12 03:00–04:00, 14:00–16:00, 18:00–19:00 Jul 13 02:00–03:00, 07:00–08:00 Jul 14 00:00–02:00, 05:00–06:00, 17:00–20:00 Jul 15 04:00–06:00, 16:00–19:00 Jul 16 04:00–06:00 Jul 18 04:00–06:00, 12:00–13:00, 16:00–17:00 Jul 19 03:00–04:00, 06:00–11:00 Jul 20 10:00–12:00 Jul 21 04:00–06:00 Jul 22 04:00–06:00 Jul 23 03:00–06:00, 16:00–17:00 Jul 24 04:00–06:00, 15:00–16:00 Jul 25 05:00–06:00, 11:00–15:00 Jul 26 05:00–08:00, 12:00–13:00 Jul 27 05:00–06:00, 08:00–09:00, 20:00–21:00 Jul 28 05:00–06:00, 17:00–20:00 Jul 29 04:00–06:00 Jul 30 17:00–18:00 Jul 31 04:00–06:00
August
Aug 5 19:00–20:00 Aug 8 05:00–06:00, 21:00–23:00 Aug 9 22:00–24:00 Aug 10 09:00–10:00, 14:00–17:00 Aug 11 05:00–07:00, 11:00–13:00 Aug 12 05:00–06:00, 12:00–13:00 Aug 13 06:00–07:00 Aug 14 06:00–08:00 Aug 15 07:00–08:00 Aug 16 02:00–04:00 Aug 17 05:00–06:00 Aug 23 09:00–10:00 Aug 28 06:00–07:00, 21:00–22:00 Aug 29 05:00–06:00 Aug 30 03:00–05:00 Aug 31 05:00–06:00, 23:00–24:00
September
Sep 1 00:00–01:00, 05:00–06:00 Sep 2 05:00–06:00, 21:00–23:00 Sep 3 05:00–06:00 Sep 4 04:00–05:00, 19:00–20:00, 22:00–23:00 Sep 5 05:00–06:00, 20:00–21:00 Sep 6 05:00–09:00, 15:00–20:00 Sep 7 04:00–06:00, 09:00–14:00, 22:00–24:00 Sep 8 05:00–06:00 Sep 9 05:00–06:00 Sep 10 05:00–06:00 Sep 11 05:00–06:00, 20:00–21:00 Sep 12 15:00–16:00 Sep 13 00:00–01:00, 07:00–08:00, 20:00–21:00 Sep 14 02:00–03:00, 12:00–15:00, 19:00–20:00 Sep 15 04:00–05:00, 17:00–20:00, 22:00–24:00 Sep 16 05:00–06:00, 19:00–20:00 Sep 17 03:00–06:00 Sep 18 05:00–06:00 Sep 19 05:00–06:00 Sep 21 03:00–04:00, 06:00–07:00 Sep 22 01:00–02:00, 05:00–07:00 Sep 23 04:00–06:00 Sep 24 00:00–01:00, 05:00–06:00 Sep 25 00:00–02:00, 05:00–06:00, 23:00–24:00 Sep 26 00:00–01:00, 04:00–05:00 Sep 27 02:00–03:00, 07:00–10:00, 14:00–15:00, 20:00–21:00 Sep 28 04:00–05:00, 13:00–14:00, 23:00–24:00 Sep 29 00:00–01:00, 05:00–06:00 Sep 30 04:00–06:00, 17:00–18:00
October
Oct 1 06:00–07:00, 19:00–20:00 Oct 2 00:00–02:00, 05:00–06:00, 19:00–20:00 Oct 3 01:00–03:00, 05:00–06:00, 12:00–13:00, 16:00–17:00 Oct 4 04:00–05:00 Oct 5 02:00–03:00 Oct 7 02:00–03:00 Oct 8 05:00–06:00 Oct 11 21:00–23:00 Oct 12 07:00–08:00, 19:00–20:00 Oct 13 00:00–01:00, 05:00–06:00 Oct 14 05:00–06:00 Oct 15 05:00–06:00, 19:00–20:00 Oct 16 03:00–06:00 Oct 18 02:00–03:00, 06:00–09:00 Oct 19 21:00–23:00 Oct 20 02:00–03:00 Oct 21 20:00–21:00 Oct 24 05:00–06:00 Oct 25 01:00–02:00, 21:00–23:00 Oct 27 05:00–07:00, 23:00–24:00 Oct 28 05:00–06:00 Oct 30 01:00–02:00 Oct 31 06:00–07:00, 19:00–20:00
November
Nov 5 02:00–03:00 Nov 10 06:00–07:00 Nov 11 01:00–02:00, 07:00–08:00, 23:00–24:00 Nov 13 02:00–03:00 Nov 15 00:00–01:00, 23:00–24:00 Nov 27 06:00–07:00 Nov 28 01:00–02:00 Nov 29 04:00–05:00 Nov 30 06:00–07:00
December
Dec 1 21:00–22:00 Dec 4 06:00–08:00 Dec 5 06:00–07:00 Dec 6 02:00–03:00, 07:00–08:00 Dec 11 22:00–23:00 Dec 12 22:00–23:00 Dec 13 23:00–24:00 Dec 15 06:00–07:00 Dec 18 22:00–23:00 Dec 30 06:00–07:00