Most often in December, 28 days.
Highest follower count seen that year: 3,375.
January
Jan 2 03:00–06:00 Jan 3 05:00–08:00 Jan 4 04:00–08:00, 12:00–13:00 Jan 5 06:00–07:00 Jan 6 03:00–05:00 Jan 7 06:00–09:00 Jan 8 02:00–05:00 Jan 18 05:00–07:00, 09:00–11:00 Jan 19 05:00–08:00 Jan 20 05:00–07:00 Jan 21 03:00–08:00 Jan 22 02:00–05:00 Jan 23 05:00–06:00, 08:00–10:00 Jan 24 06:00–08:00 Jan 25 06:00–09:00 Jan 26 07:00–09:00 Jan 27 01:00–04:00 Jan 28 03:00–08:00 Jan 29 05:00–08:00 Jan 30 05:00–09:00 Jan 31 04:00–08:00
February
Feb 1 05:00–12:00 Feb 2 05:00–08:00 Feb 3 03:00–08:00 Feb 4 02:00–08:00 Feb 5 01:00–04:00, 06:00–08:00 Feb 6 07:00–09:00 Feb 7 04:00–07:00 Feb 9 05:00–10:00 Feb 10 03:00–07:00 Feb 11 05:00–08:00 Feb 12 05:00–06:00 Feb 13 03:00–06:00 Feb 14 04:00–07:00 Feb 15 05:00–08:00
March
Mar 2 08:00–14:00 Mar 3 02:00–05:00 Mar 5 06:00–08:00, 12:00–14:00 Mar 6 06:00–13:00 Mar 7 05:00–08:00 Mar 8 07:00–11:00 Mar 9 06:00–09:00, 12:00–15:00 Mar 10 04:00–08:00 Mar 11 03:00–12:00 Mar 12 03:00–07:00 Mar 13 03:00–04:00 Mar 14 04:00–08:00 Mar 15 07:00–09:00, 11:00–13:00 Mar 16 06:00–13:00 Mar 17 04:00–07:00 Mar 18 06:00–12:00 Mar 20 05:00–07:00 Mar 22 06:00–08:00 Mar 23 05:00–08:00 Mar 24 06:00–08:00 Mar 25 05:00–12:00 Mar 26 04:00–08:00, 12:00–13:00 Mar 27 05:00–12:00 Mar 29 06:00–09:00 Mar 30 05:00–09:00, 12:00–14:00 Mar 31 04:00–08:00
April
Apr 1 06:00–10:00 Apr 2 03:00–08:00 Apr 3 03:00–05:00 Apr 4 05:00–08:00 Apr 5 05:00–08:00 Apr 7 04:00–07:00 Apr 8 04:00–05:00, 07:00–11:00 Apr 9 02:00–08:00 Apr 10 03:00–07:00 Apr 11 04:00–05:00 Apr 12 02:00–04:00 Apr 13 05:00–08:00 Apr 14 03:00–08:00 Apr 15 04:00–07:00 Apr 20 12:00–14:00 Apr 21 05:00–07:00 Apr 22 02:00–04:00, 06:00–08:00 Apr 23 01:00–03:00 Apr 25 03:00–09:00 Apr 26 05:00–08:00 Apr 27 06:00–09:00 Apr 29 05:00–08:00, 10:00–13:00 Apr 30 05:00–08:00
May
May 1 04:00–07:00 May 2 05:00–08:00, 11:00–13:00 May 3 05:00–09:00, 12:00–15:00 May 4 05:00–13:00 May 5 04:00–06:00 May 6 05:00–08:00, 11:00–14:00 May 8 06:00–07:00 May 9 05:00–11:00 May 11 06:00–09:00, 12:00–15:00 May 14 04:00–08:00 May 15 05:00–07:00 May 16 05:00–06:00 May 17 06:00–08:00 May 18 06:00–08:00 May 19 02:00–06:00 May 20 04:00–07:00 May 21 04:00–08:00 May 23 06:00–09:00 May 24 06:00–09:00 May 25 09:00–13:00 May 26 06:00–08:00, 11:00–14:00 May 27 04:00–12:00 May 28 05:00–10:00 May 29 04:00–13:00 May 30 05:00–08:00 May 31 06:00–22:00
June
Jun 1 07:00–09:00, 12:00–16:00 Jun 2 06:00–09:00 Jun 3 03:00–07:00 Jun 4 05:00–06:00 Jun 5 06:00–13:00 Jun 6 05:00–08:00, 11:00–14:00 Jun 7 06:00–08:00 Jun 8 04:00–08:00, 11:00–14:00 Jun 9 04:00–08:00 Jun 10 06:00–07:00 Jun 14 06:00–09:00, 13:00–15:00 Jun 15 07:00–12:00 Jun 16 06:00–08:00 Jun 17 05:00–06:00, 08:00–10:00 Jun 18 04:00–06:00 Jun 19 06:00–07:00 Jun 20 05:00–10:00, 13:00–16:00 Jun 21 06:00–14:00 Jun 22 04:00–08:00 Jun 24 03:00–07:00 Jun 26 07:00–10:00 Jun 28 05:00–06:00 Jun 29 07:00–08:00 Jun 30 05:00–09:00
July
Jul 1 06:00–08:00 Jul 2 05:00–08:00, 10:00–12:00 Jul 3 04:00–07:00 Jul 5 06:00–08:00, 10:00–12:00 Jul 9 06:00–08:00, 11:00–14:00 Jul 10 06:00–08:00, 11:00–13:00 Jul 11 07:00–08:00, 11:00–15:00 Jul 12 07:00–11:00 Jul 13 06:00–07:00, 11:00–13:00 Jul 14 06:00–07:00 Jul 15 04:00–08:00 Jul 16 03:00–07:00 Jul 17 07:00–08:00 Jul 18 03:00–08:00 Jul 19 06:00–09:00, 12:00–15:00 Jul 20 04:00–09:00 Jul 21 04:00–08:00 Jul 22 06:00–09:00 Jul 23 05:00–08:00 Jul 24 06:00–07:00 Jul 25 04:00–06:00 Jul 26 03:00–08:00 Jul 30 04:00–05:00
August
Aug 29 07:00–08:00 Aug 31 06:00–08:00
September
Sep 4 06:00–08:00 Sep 5 07:00–09:00 Sep 7 08:00–14:00 Sep 8 04:00–09:00 Sep 9 05:00–09:00 Sep 11 07:00–10:00 Sep 12 07:00–12:00 Sep 14 06:00–09:00 Sep 15 04:00–05:00 Sep 16 05:00–09:00 Sep 17 04:00–05:00 Sep 20 03:00–08:00 Sep 21 06:00–09:00, 13:00–16:00 Sep 22 05:00–06:00 Sep 23 02:00–06:00 Sep 24 04:00–06:00 Sep 26 07:00–09:00 Sep 27 03:00–06:00
October
Oct 1 05:00–09:00 Oct 2 05:00–07:00 Oct 3 02:00–07:00 Oct 4 05:00–09:00 Oct 5 06:00–13:00 Oct 6 05:00–06:00 Oct 7 05:00–12:00 Oct 9 05:00–07:00 Oct 10 06:00–09:00 Oct 11 04:00–07:00, 11:00–14:00 Oct 12 05:00–09:00, 12:00–14:00 Oct 13 05:00–08:00, 10:00–12:00 Oct 14 02:00–07:00 Oct 15 04:00–08:00, 10:00–12:00 Oct 16 05:00–09:00 Oct 17 05:00–09:00, 11:00–13:00 Oct 18 04:00–09:00, 11:00–13:00 Oct 19 05:00–09:00, 11:00–14:00 Oct 20 04:00–08:00 Oct 21 06:00–11:00 Oct 22 03:00–05:00 Oct 23 06:00–09:00 Oct 24 06:00–08:00 Oct 26 07:00–09:00 Oct 27 02:00–08:00 Oct 29 04:00–08:00, 10:00–11:00 Oct 31 07:00–08:00
November
Nov 1 04:00–07:00, 11:00–12:00 Nov 2 05:00–06:00, 08:00–09:00 Nov 3 05:00–11:00 Nov 4 05:00–07:00, 10:00–12:00 Nov 5 05:00–13:00 Nov 6 05:00–08:00 Nov 8 04:00–07:00 Nov 9 06:00–14:00 Nov 10 05:00–06:00 Nov 11 06:00–12:00 Nov 12 05:00–08:00, 10:00–11:00 Nov 13 06:00–10:00 Nov 14 06:00–09:00 Nov 15 03:00–08:00 Nov 16 05:00–09:00, 13:00–16:00 Nov 17 05:00–08:00 Nov 18 06:00–08:00 Nov 20 06:00–07:00 Nov 24 04:00–08:00 Nov 27 05:00–11:00 Nov 28 06:00–14:00 Nov 29 06:00–14:00 Nov 30 06:00–09:00, 12:00–15:00
December
Dec 1 05:00–12:00 Dec 2 04:00–12:00 Dec 3 05:00–10:00 Dec 4 05:00–09:00 Dec 5 06:00–09:00 Dec 6 03:00–09:00, 11:00–14:00 Dec 7 06:00–09:00 Dec 8 06:00–09:00 Dec 9 05:00–09:00 Dec 10 06:00–07:00 Dec 11 07:00–11:00 Dec 12 03:00–08:00 Dec 13 04:00–05:00, 07:00–09:00 Dec 15 04:00–10:00 Dec 16 04:00–07:00, 10:00–11:00 Dec 19 06:00–10:00 Dec 20 04:00–09:00 Dec 21 06:00–07:00 Dec 22 04:00–07:00 Dec 23 06:00–11:00 Dec 24 04:00–07:00 Dec 25 05:00–10:00 Dec 26 05:00–10:00 Dec 27 04:00–11:00 Dec 28 05:00–12:00 Dec 29 07:00–09:00 Dec 30 05:00–09:00 Dec 31 05:00–08:00