Most often in January, 27 days.
Highest follower count seen that year: 12,173.
January
Jan 3 02:00–14:00 Jan 4 01:00–14:00 Jan 5 03:00–14:00 Jan 6 03:00–12:00 Jan 7 03:00–13:00 Jan 8 03:00–11:00 Jan 10 02:00–06:00, 08:00–15:00 Jan 11 00:00–15:00 Jan 12 04:00–16:00 Jan 13 03:00–14:00 Jan 15 07:00–15:00 Jan 16 03:00–12:00 Jan 17 02:00–13:00 Jan 18 02:00–13:00 Jan 19 03:00–12:00 Jan 20 05:00–16:00 Jan 21 03:00–15:00 Jan 22 03:00–09:00, 14:00–18:00 Jan 23 07:00–17:00 Jan 24 04:00–10:00 Jan 25 02:00–13:00 Jan 26 02:00–11:00 Jan 27 03:00–15:00 Jan 28 04:00–14:00 Jan 29 07:00–16:00 Jan 30 09:00–17:00 Jan 31 02:00–13:00
February
Feb 1 03:00–13:00 Feb 2 04:00–14:00 Feb 10 05:00–15:00 Feb 11 06:00–13:00 Feb 13 01:00–05:00, 09:00–14:00 Feb 14 03:00–08:00 Feb 15 00:00–07:00, 09:00–15:00 Feb 16 03:00–14:00 Feb 17 05:00–12:00 Feb 18 09:00–14:00 Feb 19 05:00–11:00 Feb 22 01:00–14:00 Feb 23 03:00–10:00 Feb 24 02:00–08:00, 12:00–14:00 Feb 26 03:00–15:00 Feb 27 08:00–13:00 Feb 28 03:00–15:00
March
Mar 1 03:00–14:00 Mar 2 04:00–13:00 Mar 3 03:00–14:00 Mar 4 03:00–12:00 Mar 6 04:00–08:00 Mar 7 01:00–13:00 Mar 8 03:00–14:00 Mar 9 03:00–13:00 Mar 13 03:00–15:00 Mar 14 03:00–14:00 Mar 15 01:00–13:00 Mar 16 08:00–18:00 Mar 17 05:00–14:00 Mar 18 09:00–15:00 Mar 20 07:00–18:00 Mar 21 07:00–09:00 Mar 23 01:00–11:00 Mar 24 07:00–14:00 Mar 26 03:00–14:00 Mar 27 07:00–13:00 Mar 28 03:00–13:00 Mar 29 03:00–15:00 Mar 30 07:00–14:00 Mar 31 05:00–14:00
April
Apr 1 06:00–13:00 Apr 2 03:00–14:00 Apr 3 05:00–11:00 Apr 4 04:00–15:00 Apr 5 03:00–12:00 Apr 7 11:00–16:00 Apr 8 05:00–13:00 Apr 9 09:00–16:00 Apr 10 03:00–14:00 Apr 11 04:00–11:00, 23:00–24:00 Apr 12 00:00–10:00 Apr 13 07:00–12:00 Apr 16 03:00–12:00 Apr 17 05:00–14:00 Apr 19 02:00–07:00 Apr 20 08:00–11:00 Apr 21 06:00–15:00 Apr 22 03:00–13:00 Apr 23 03:00–12:00 Apr 24 05:00–09:00 Apr 25 01:00–12:00 Apr 26 05:00–11:00 Apr 27 01:00–13:00 Apr 28 06:00–14:00 Apr 30 06:00–13:00
May
May 1 03:00–13:00 May 2 21:00–24:00 May 3 00:00–10:00 May 4 04:00–15:00 May 5 04:00–14:00 May 7 11:00–16:00 May 8 05:00–07:00, 09:00–15:00 May 9 04:00–12:00 May 10 03:00–15:00 May 11 07:00–15:00 May 13 03:00–06:00, 08:00–12:00 May 14 03:00–10:00 May 15 00:00–05:00, 12:00–16:00 May 17 03:00–15:00 May 18 01:00–10:00 May 19 03:00–12:00 May 21 04:00–11:00 May 22 08:00–10:00 May 23 03:00–13:00 May 24 02:00–09:00, 12:00–13:00 May 25 01:00–05:00 May 27 04:00–12:00 May 29 03:00–13:00 May 31 03:00–12:00
June
Jun 1 06:00–13:00 Jun 2 05:00–12:00 Jun 6 04:00–08:00 Jun 7 04:00–12:00 Jun 8 02:00–06:00, 08:00–14:00 Jun 9 03:00–13:00 Jun 11 07:00–13:00 Jun 13 21:00–23:00 Jun 14 08:00–09:00, 11:00–13:00 Jun 15 08:00–12:00 Jun 20 03:00–10:00, 14:00–16:00 Jun 21 03:00–12:00 Jun 22 04:00–13:00 Jun 23 03:00–14:00 Jun 24 04:00–13:00 Jun 25 04:00–12:00 Jun 26 04:00–10:00 Jun 27 05:00–12:00 Jun 28 04:00–07:00, 11:00–14:00 Jun 29 03:00–14:00
July
Jul 1 08:00–12:00 Jul 2 03:00–10:00 Jul 8 04:00–11:00 Jul 9 03:00–08:00 Jul 11 03:00–12:00 Jul 12 03:00–12:00 Jul 13 03:00–14:00 Jul 14 03:00–07:00, 09:00–11:00 Jul 15 04:00–14:00 Jul 16 03:00–11:00 Jul 17 03:00–10:00 Jul 18 03:00–10:00 Jul 19 05:00–13:00 Jul 20 04:00–12:00 Jul 21 03:00–11:00 Jul 22 04:00–11:00 Jul 23 03:00–09:00 Jul 24 03:00–14:00 Jul 25 03:00–13:00 Jul 26 04:00–11:00 Jul 27 04:00–13:00 Jul 28 03:00–13:00 Jul 29 04:00–10:00 Jul 30 03:00–11:00 Jul 31 03:00–13:00
August
Aug 1 03:00–11:00 Aug 2 03:00–13:00 Aug 3 04:00–13:00 Aug 4 03:00–09:00 Aug 20 03:00–14:00 Aug 25 04:00–11:00 Aug 26 03:00–07:00 Aug 27 04:00–13:00 Aug 28 05:00–12:00 Aug 29 04:00–12:00 Aug 30 04:00–09:00 Aug 31 03:00–11:00
September
Sep 1 03:00–11:00 Sep 3 03:00–13:00 Sep 4 07:00–14:00 Sep 5 01:00–11:00 Sep 8 05:00–14:00 Sep 9 05:00–12:00, 23:00–24:00 Sep 10 00:00–02:00 Sep 11 11:00–14:00 Sep 12 05:00–12:00 Sep 13 04:00–15:00 Sep 14 03:00–13:00 Sep 15 04:00–13:00 Sep 16 03:00–12:00 Sep 17 03:00–14:00 Sep 18 04:00–11:00 Sep 19 04:00–09:00 Sep 20 01:00–03:00 Sep 22 06:00–13:00 Sep 23 08:00–14:00 Sep 25 04:00–14:00 Sep 26 05:00–14:00 Sep 27 09:00–20:00 Sep 29 08:00–13:00 Sep 30 03:00–09:00
October
Oct 1 03:00–14:00 Oct 2 03:00–13:00 Oct 3 04:00–13:00 Oct 4 03:00–12:00 Oct 5 05:00–13:00 Oct 10 03:00–10:00 Oct 11 01:00–12:00 Oct 12 04:00–10:00 Oct 13 03:00–12:00 Oct 14 05:00–12:00 Oct 16 04:00–12:00 Oct 17 04:00–14:00 Oct 18 02:00–10:00 Oct 21 04:00–14:00 Oct 22 04:00–12:00 Oct 23 04:00–07:00 Oct 24 04:00–13:00 Oct 25 06:00–13:00 Oct 26 04:00–10:00 Oct 27 03:00–12:00 Oct 29 04:00–12:00 Oct 30 04:00–12:00 Oct 31 03:00–14:00
November
Nov 1 04:00–12:00 Nov 4 08:00–14:00 Nov 5 03:00–12:00 Nov 6 05:00–13:00 Nov 7 04:00–12:00 Nov 8 05:00–13:00 Nov 9 04:00–13:00 Nov 10 07:00–14:00 Nov 11 08:00–13:00 Nov 12 07:00–10:00 Nov 13 06:00–13:00 Nov 14 06:00–14:00 Nov 15 03:00–12:00 Nov 16 04:00–13:00 Nov 17 07:00–14:00 Nov 19 04:00–11:00 Nov 20 06:00–11:00 Nov 21 04:00–13:00 Nov 22 06:00–11:00, 21:00–23:00 Nov 24 03:00–12:00 Nov 25 05:00–12:00 Nov 26 08:00–13:00 Nov 27 04:00–13:00 Nov 28 04:00–13:00 Nov 29 05:00–13:00 Nov 30 04:00–13:00
December
Dec 1 05:00–13:00 Dec 2 07:00–12:00 Dec 3 08:00–14:00 Dec 4 06:00–13:00 Dec 5 04:00–14:00 Dec 6 06:00–12:00 Dec 7 03:00–09:00 Dec 10 04:00–14:00 Dec 11 09:00–16:00 Dec 12 03:00–14:00 Dec 13 05:00–12:00 Dec 14 06:00–10:00 Dec 16 10:00–13:00 Dec 17 03:00–14:00 Dec 18 04:00–13:00 Dec 19 07:00–14:00 Dec 20 06:00–13:00 Dec 21 03:00–14:00 Dec 22 04:00–13:00 Dec 23 04:00–13:00 Dec 27 04:00–06:00, 08:00–09:00 Dec 28 04:00–11:00 Dec 29 04:00–05:00, 07:00–12:00 Dec 30 04:00–11:00 Dec 31 07:00–13:00