Most often in January, 29 days.
Highest follower count seen that year: 50,956.
January
Jan 1 08:00–11:00 Jan 2 05:00–09:00 Jan 3 06:00–11:00 Jan 4 05:00–06:00 Jan 6 05:00–10:00 Jan 7 05:00–10:00 Jan 8 05:00–09:00 Jan 9 05:00–09:00 Jan 10 05:00–12:00 Jan 11 07:00–08:00, 10:00–12:00 Jan 12 06:00–07:00 Jan 14 06:00–10:00 Jan 15 05:00–09:00 Jan 16 05:00–09:00 Jan 17 05:00–07:00 Jan 18 04:00–10:00 Jan 19 05:00–06:00 Jan 20 05:00–06:00 Jan 21 04:00–10:00 Jan 22 04:00–09:00 Jan 23 05:00–07:00 Jan 24 05:00–07:00 Jan 25 04:00–05:00 Jan 26 04:00–07:00 Jan 27 07:00–10:00 Jan 28 06:00–10:00 Jan 29 05:00–07:00 Jan 30 05:00–08:00 Jan 31 04:00–09:00
February
Feb 2 06:00–10:00 Feb 3 04:00–05:00 Feb 4 05:00–07:00 Feb 5 04:00–05:00, 10:00–13:00 Feb 6 04:00–06:00 Feb 7 04:00–05:00 Feb 8 04:00–07:00 Feb 9 04:00–08:00 Feb 10 05:00–09:00 Feb 11 04:00–07:00 Feb 12 05:00–09:00 Feb 13 04:00–08:00 Feb 14 06:00–10:00 Feb 15 04:00–09:00 Feb 16 05:00–07:00, 10:00–12:00 Feb 17 04:00–07:00 Feb 18 05:00–07:00 Feb 19 04:00–06:00 Feb 20 07:00–10:00 Feb 21 06:00–10:00 Feb 23 05:00–06:00 Feb 25 05:00–08:00 Feb 26 05:00–06:00 Feb 27 05:00–08:00 Feb 28 05:00–09:00
March
Mar 1 05:00–09:00 Mar 2 05:00–07:00 Mar 3 05:00–10:00 Mar 4 05:00–09:00 Mar 5 06:00–10:00 Mar 6 04:00–08:00 Mar 7 09:00–12:00 Mar 8 08:00–11:00 Mar 9 05:00–07:00 Mar 10 07:00–11:00 Mar 11 05:00–06:00 Mar 12 05:00–08:00 Mar 13 04:00–06:00 Mar 15 05:00–07:00 Mar 16 05:00–09:00 Mar 17 06:00–10:00 Mar 19 05:00–08:00 Mar 20 05:00–11:00 Mar 21 05:00–08:00 Mar 22 06:00–09:00 Mar 23 05:00–10:00 Mar 24 05:00–08:00 Mar 25 05:00–07:00 Mar 26 04:00–06:00 Mar 27 05:00–08:00 Mar 28 04:00–06:00, 08:00–09:00 Mar 29 05:00–08:00 Mar 30 05:00–06:00 Mar 31 04:00–08:00
April
Apr 1 04:00–07:00 Apr 2 05:00–08:00 Apr 3 04:00–08:00, 14:00–16:00 Apr 4 04:00–08:00 Apr 5 05:00–09:00 Apr 6 05:00–06:00 Apr 7 04:00–08:00 Apr 8 04:00–06:00 Apr 9 04:00–09:00 Apr 10 04:00–08:00 Apr 11 05:00–08:00 Apr 12 04:00–07:00 Apr 13 04:00–09:00 Apr 14 04:00–08:00 Apr 15 04:00–06:00 Apr 16 04:00–08:00 Apr 17 04:00–05:00 Apr 18 04:00–08:00 Apr 21 08:00–09:00 Apr 22 06:00–11:00 Apr 23 04:00–07:00 Apr 25 04:00–08:00 Apr 27 04:00–08:00 Apr 28 06:00–08:00
May
May 1 04:00–09:00 May 2 05:00–08:00 May 3 04:00–05:00 May 4 04:00–09:00 May 5 04:00–08:00 May 6 04:00–06:00 May 7 04:00–06:00 May 8 04:00–06:00 May 9 04:00–05:00 May 10 04:00–08:00 May 11 05:00–08:00 May 12 06:00–09:00 May 13 04:00–09:00 May 14 05:00–08:00 May 16 04:00–10:00 May 17 04:00–06:00 May 18 04:00–06:00 May 19 03:00–07:00 May 20 04:00–08:00 May 21 04:00–08:00 May 22 04:00–07:00 May 23 04:00–07:00 May 24 04:00–08:00 May 25 04:00–08:00 May 26 04:00–05:00 May 29 04:00–05:00 May 30 04:00–06:00 May 31 04:00–07:00
June
Jun 1 06:00–09:00 Jun 2 04:00–06:00 Jun 3 04:00–07:00 Jun 4 05:00–08:00 Jun 5 04:00–07:00 Jun 6 05:00–07:00 Jun 7 04:00–06:00 Jun 8 07:00–12:00 Jun 9 04:00–06:00 Jun 10 05:00–06:00 Jun 11 04:00–08:00 Jun 12 04:00–06:00 Jun 13 04:00–07:00 Jun 14 04:00–08:00 Jun 15 04:00–08:00 Jun 16 05:00–08:00 Jun 18 04:00–08:00 Jun 19 05:00–08:00 Jun 20 04:00–09:00 Jun 21 04:00–06:00 Jun 22 04:00–07:00 Jun 23 04:00–07:00 Jun 24 04:00–09:00 Jun 25 05:00–10:00 Jun 26 04:00–08:00 Jun 27 04:00–07:00 Jun 29 05:00–08:00 Jun 30 05:00–09:00
July
Jul 1 05:00–08:00 Jul 2 05:00–09:00 Jul 3 03:00–05:00 Jul 4 04:00–08:00 Jul 5 06:00–11:00 Jul 7 08:00–11:00 Jul 8 08:00–12:00 Jul 9 08:00–10:00 Jul 10 09:00–13:00 Jul 11 07:00–10:00 Jul 12 08:00–12:00 Jul 13 05:00–07:00 Jul 14 08:00–10:00 Jul 16 05:00–10:00 Jul 17 07:00–09:00 Jul 18 07:00–10:00 Jul 19 08:00–10:00 Jul 20 08:00–12:00 Jul 21 08:00–09:00 Jul 22 08:00–10:00 Jul 23 08:00–10:00 Jul 24 07:00–11:00 Jul 25 08:00–09:00 Jul 28 07:00–09:00 Jul 29 07:00–09:00 Jul 30 07:00–11:00 Jul 31 07:00–10:00
August
Aug 1 07:00–10:00 Aug 2 07:00–08:00 Aug 3 08:00–09:00 Aug 5 10:00–12:00 Aug 6 07:00–10:00 Aug 7 08:00–09:00 Aug 8 07:00–12:00 Aug 9 07:00–11:00 Aug 10 06:00–10:00 Aug 11 07:00–12:00 Aug 12 07:00–11:00 Aug 13 05:00–09:00 Aug 15 06:00–10:00 Aug 16 05:00–09:00 Aug 18 06:00–10:00 Aug 19 05:00–10:00 Aug 20 06:00–10:00 Aug 21 08:00–12:00 Aug 22 05:00–10:00 Aug 23 05:00–10:00 Aug 24 05:00–09:00 Aug 25 06:00–10:00 Aug 26 06:00–09:00 Aug 27 05:00–10:00 Aug 28 06:00–10:00 Aug 29 06:00–09:00 Aug 30 05:00–07:00 Aug 31 05:00–06:00
September
Sep 1 06:00–08:00 Sep 2 05:00–09:00 Sep 3 05:00–06:00 Sep 4 05:00–09:00 Sep 5 07:00–11:00 Sep 6 06:00–08:00 Sep 7 07:00–09:00 Sep 8 06:00–11:00, 15:00–16:00 Sep 9 06:00–09:00 Sep 10 08:00–09:00 Sep 11 05:00–06:00 Sep 12 05:00–08:00 Sep 14 05:00–08:00 Sep 15 05:00–08:00 Sep 16 06:00–09:00 Sep 17 04:00–08:00 Sep 18 05:00–09:00 Sep 19 06:00–10:00 Sep 20 05:00–10:00 Sep 21 05:00–08:00 Sep 22 05:00–10:00 Sep 23 05:00–08:00 Sep 24 05:00–09:00 Sep 25 05:00–08:00 Sep 26 05:00–09:00 Sep 27 05:00–08:00 Sep 28 07:00–10:00 Sep 29 06:00–10:00 Sep 30 05:00–09:00
October
Oct 1 05:00–07:00 Oct 2 05:00–08:00 Oct 3 05:00–10:00 Oct 4 04:00–06:00 Oct 5 07:00–12:00 Oct 6 04:00–08:00 Oct 7 05:00–10:00 Oct 8 05:00–10:00 Oct 9 05:00–09:00 Oct 10 05:00–09:00 Oct 11 04:00–09:00 Oct 12 06:00–11:00 Oct 13 14:00–18:00 Oct 14 06:00–13:00 Oct 15 06:00–12:00 Oct 17 06:00–11:00 Oct 18 06:00–11:00 Oct 19 05:00–09:00 Oct 20 09:00–13:00 Oct 22 07:00–09:00 Oct 23 06:00–10:00 Oct 24 09:00–10:00 Oct 26 09:00–11:00 Oct 27 09:00–13:00 Oct 28 09:00–13:00 Oct 29 11:00–14:00 Oct 30 10:00–11:00 Oct 31 07:00–10:00
November
Nov 1 06:00–07:00 Nov 2 08:00–10:00 Nov 6 06:00–10:00, 14:00–17:00 Nov 7 07:00–10:00 Nov 8 07:00–09:00 Nov 10 07:00–10:00 Nov 11 06:00–09:00 Nov 12 06:00–09:00 Nov 13 07:00–11:00 Nov 14 07:00–09:00 Nov 15 07:00–09:00 Nov 16 07:00–12:00 Nov 17 06:00–08:00 Nov 19 06:00–08:00 Nov 20 05:00–10:00 Nov 21 05:00–09:00 Nov 22 06:00–10:00 Nov 23 06:00–07:00 Nov 24 06:00–09:00
December
Dec 2 06:00–09:00 Dec 3 06:00–09:00 Dec 4 06:00–08:00 Dec 5 06:00–12:00 Dec 6 06:00–09:00 Dec 7 10:00–12:00 Dec 8 06:00–09:00 Dec 9 06:00–09:00 Dec 10 06:00–08:00, 11:00–13:00 Dec 11 06:00–08:00 Dec 13 09:00–11:00 Dec 14 06:00–10:00 Dec 15 07:00–11:00 Dec 16 05:00–07:00 Dec 17 06:00–08:00 Dec 19 06:00–09:00 Dec 20 05:00–10:00 Dec 27 09:00–11:00 Dec 29 08:00–13:00