Most often in August, 29 days.
Highest follower count seen that year: 266.
January
Jan 1 18:00–23:00 Jan 2 00:00–07:00 Jan 6 03:00–09:00 Jan 7 04:00–08:00 Jan 8 08:00–09:00 Jan 12 06:00–09:00 Jan 23 05:00–07:00 Jan 26 04:00–06:00 Jan 30 04:00–05:00 Jan 31 22:00–23:00
February
Feb 1 02:00–03:00 Feb 2 04:00–06:00 Feb 3 23:00–24:00 Feb 4 01:00–02:00, 11:00–14:00 Feb 6 03:00–06:00 Feb 8 03:00–05:00 Feb 16 06:00–09:00 Feb 17 05:00–07:00 Feb 25 05:00–06:00
March
Mar 8 08:00–11:00 Mar 10 07:00–09:00 Mar 11 05:00–08:00 Mar 12 06:00–08:00 Mar 13 04:00–09:00 Mar 14 07:00–10:00 Mar 15 07:00–10:00 Mar 16 06:00–10:00 Mar 17 07:00–10:00 Mar 18 05:00–09:00 Mar 19 02:00–07:00, 14:00–21:00 Mar 20 03:00–08:00, 12:00–23:00 Mar 21 11:00–17:00, 20:00–24:00 Mar 22 00:00–04:00 Mar 23 00:00–08:00 Mar 24 08:00–13:00 Mar 28 19:00–20:00 Mar 31 04:00–08:00
April
Apr 4 03:00–06:00 Apr 5 03:00–06:00 Apr 8 00:00–08:00 Apr 11 02:00–07:00 Apr 12 23:00–24:00 Apr 13 00:00–01:00 Apr 14 05:00–07:00 Apr 16 07:00–11:00 Apr 17 12:00–15:00 Apr 22 06:00–08:00 Apr 24 03:00–07:00 Apr 25 19:00–23:00 Apr 26 05:00–09:00, 21:00–24:00 Apr 27 00:00–03:00, 05:00–10:00, 22:00–23:00 Apr 28 00:00–01:00, 07:00–08:00 Apr 29 05:00–10:00
May
May 1 05:00–10:00 May 2 03:00–06:00, 21:00–22:00 May 3 01:00–08:00 May 4 04:00–07:00 May 5 04:00–10:00 May 6 02:00–08:00, 17:00–18:00, 20:00–24:00 May 7 00:00–09:00, 23:00–24:00 May 8 00:00–07:00, 18:00–24:00 May 9 00:00–09:00, 21:00–24:00 May 10 00:00–09:00, 21:00–24:00 May 11 00:00–08:00 May 12 15:00–17:00 May 13 05:00–10:00, 18:00–24:00 May 14 01:00–07:00, 18:00–20:00 May 15 13:00–24:00 May 16 00:00–09:00 May 17 02:00–08:00 May 18 04:00–11:00 May 19 00:00–08:00, 19:00–24:00 May 20 00:00–05:00, 11:00–13:00 May 22 10:00–12:00 May 24 13:00–17:00 May 25 04:00–06:00, 22:00–24:00 May 26 02:00–05:00, 17:00–22:00 May 28 00:00–02:00, 13:00–15:00, 17:00–19:00, 23:00–24:00 May 29 00:00–04:00, 13:00–15:00 May 31 01:00–07:00
June
Jun 1 01:00–02:00, 05:00–08:00 Jun 3 02:00–08:00 Jun 5 18:00–20:00 Jun 6 00:00–02:00 Jun 7 12:00–16:00 Jun 10 06:00–07:00 Jun 15 02:00–04:00 Jun 16 05:00–06:00 Jun 17 04:00–06:00 Jun 18 10:00–11:00 Jun 21 05:00–07:00 Jun 22 05:00–10:00 Jun 26 06:00–09:00 Jun 27 06:00–11:00 Jun 29 06:00–10:00 Jun 30 03:00–07:00
July
Jul 1 05:00–07:00 Jul 2 06:00–10:00 Jul 3 07:00–10:00 Jul 4 05:00–11:00 Jul 5 06:00–10:00, 23:00–24:00 Jul 6 02:00–06:00, 22:00–24:00 Jul 7 02:00–08:00 Jul 8 02:00–08:00, 18:00–23:00 Jul 9 03:00–09:00 Jul 10 01:00–05:00, 12:00–17:00 Jul 11 05:00–08:00 Jul 12 02:00–09:00 Jul 14 03:00–07:00 Jul 15 12:00–15:00, 20:00–24:00 Jul 16 03:00–07:00, 18:00–24:00 Jul 17 07:00–11:00 Jul 18 04:00–09:00 Jul 19 05:00–11:00 Jul 20 03:00–09:00 Jul 21 07:00–08:00 Jul 23 00:00–07:00 Jul 24 04:00–11:00 Jul 25 06:00–09:00 Jul 26 02:00–11:00 Jul 27 05:00–09:00, 21:00–24:00 Jul 28 00:00–09:00 Jul 29 07:00–11:00 Jul 31 02:00–03:00, 05:00–08:00, 13:00–15:00
August
Aug 1 03:00–09:00 Aug 2 03:00–10:00 Aug 3 16:00–24:00 Aug 4 00:00–11:00 Aug 5 06:00–11:00 Aug 6 09:00–11:00 Aug 7 06:00–10:00, 17:00–23:00 Aug 8 15:00–18:00, 21:00–24:00 Aug 9 00:00–07:00 Aug 10 02:00–08:00 Aug 11 00:00–08:00 Aug 12 00:00–11:00, 18:00–24:00 Aug 13 00:00–08:00, 21:00–24:00 Aug 14 00:00–01:00, 03:00–08:00 Aug 15 07:00–13:00 Aug 16 04:00–10:00 Aug 17 02:00–06:00 Aug 18 00:00–05:00 Aug 19 09:00–14:00 Aug 20 02:00–08:00, 12:00–14:00 Aug 21 07:00–10:00 Aug 22 04:00–08:00 Aug 23 11:00–15:00 Aug 24 07:00–10:00 Aug 25 04:00–06:00 Aug 26 07:00–09:00 Aug 29 05:00–07:00 Aug 30 04:00–07:00, 21:00–23:00 Aug 31 02:00–04:00, 06:00–10:00
September
Sep 1 07:00–10:00 Sep 2 04:00–09:00 Sep 3 03:00–11:00, 16:00–18:00, 20:00–23:00 Sep 4 04:00–10:00, 21:00–24:00 Sep 5 02:00–09:00 Sep 6 01:00–11:00 Sep 7 06:00–10:00 Sep 8 04:00–09:00 Sep 10 04:00–10:00 Sep 12 06:00–10:00 Sep 13 10:00–15:00 Sep 14 04:00–06:00, 14:00–22:00 Sep 15 05:00–10:00, 22:00–24:00 Sep 16 01:00–11:00, 23:00–24:00 Sep 17 00:00–06:00 Sep 18 01:00–08:00 Sep 24 11:00–12:00 Sep 26 19:00–21:00 Sep 27 01:00–07:00 Sep 28 01:00–08:00 Sep 29 02:00–09:00
October
Oct 1 05:00–09:00 Oct 4 05:00–11:00 Oct 6 02:00–07:00 Oct 7 02:00–10:00 Oct 8 04:00–08:00 Oct 9 03:00–09:00, 22:00–24:00 Oct 10 01:00–06:00, 22:00–24:00 Oct 11 00:00–01:00, 04:00–09:00, 22:00–24:00 Oct 12 02:00–08:00 Oct 13 05:00–10:00 Oct 14 07:00–09:00 Oct 15 02:00–08:00 Oct 17 04:00–08:00 Oct 18 03:00–06:00 Oct 26 01:00–03:00 Oct 29 03:00–06:00 Oct 30 23:00–24:00 Oct 31 00:00–01:00, 03:00–07:00
November
Nov 3 05:00–07:00 Nov 7 05:00–07:00, 20:00–22:00 Nov 8 04:00–06:00 Nov 9 03:00–07:00 Nov 10 00:00–04:00 Nov 14 04:00–07:00 Nov 15 06:00–07:00 Nov 16 01:00–07:00 Nov 17 02:00–07:00 Nov 18 06:00–08:00 Nov 19 04:00–08:00 Nov 21 03:00–07:00 Nov 22 03:00–05:00 Nov 25 05:00–06:00 Nov 26 07:00–10:00 Nov 27 02:00–07:00 Nov 28 01:00–09:00 Nov 29 01:00–08:00 Nov 30 02:00–07:00, 21:00–24:00
December
Dec 1 01:00–06:00 Dec 2 02:00–08:00 Dec 3 01:00–09:00 Dec 4 11:00–17:00 Dec 5 01:00–08:00, 20:00–24:00 Dec 6 00:00–06:00 Dec 7 06:00–11:00, 21:00–22:00 Dec 8 00:00–02:00, 06:00–10:00 Dec 9 00:00–09:00 Dec 11 05:00–10:00 Dec 12 03:00–10:00 Dec 13 02:00–06:00 Dec 14 05:00–10:00 Dec 16 04:00–07:00 Dec 19 07:00–09:00 Dec 20 02:00–08:00 Dec 21 03:00–08:00 Dec 22 02:00–08:00 Dec 24 02:00–07:00 Dec 27 08:00–09:00 Dec 28 05:00–08:00 Dec 29 07:00–08:00 Dec 30 05:00–11:00, 20:00–21:00 Dec 31 02:00–11:00