Most often in March, 31 days.
Highest follower count seen that year: 20,524.
February
Feb 12 11:00–13:00, 19:00–22:00 Feb 13 05:00–09:00, 12:00–14:00 Feb 14 01:00–05:00, 08:00–09:00 Feb 15 05:00–09:00, 12:00–14:00, 19:00–20:00 Feb 16 01:00–03:00, 05:00–13:00, 16:00–17:00 Feb 17 02:00–04:00, 06:00–13:00 Feb 18 05:00–06:00, 08:00–09:00, 11:00–13:00 Feb 19 03:00–07:00, 13:00–14:00, 18:00–19:00 Feb 20 09:00–15:00, 18:00–21:00 Feb 21 10:00–14:00, 18:00–19:00, 21:00–22:00 Feb 22 06:00–08:00, 18:00–20:00 Feb 23 05:00–07:00, 12:00–15:00 Feb 24 06:00–09:00, 12:00–15:00, 17:00–18:00 Feb 25 05:00–15:00 Feb 26 07:00–14:00 Feb 27 05:00–08:00, 12:00–14:00 Feb 28 12:00–15:00, 17:00–21:00
March
Mar 1 14:00–17:00 Mar 2 05:00–09:00, 12:00–15:00, 17:00–18:00 Mar 3 06:00–09:00, 12:00–15:00 Mar 4 05:00–08:00, 12:00–15:00, 20:00–21:00 Mar 5 05:00–08:00, 12:00–14:00 Mar 6 07:00–09:00 Mar 7 05:00–07:00, 13:00–17:00 Mar 8 06:00–13:00 Mar 9 05:00–09:00, 12:00–14:00 Mar 10 05:00–08:00, 12:00–17:00 Mar 11 05:00–08:00, 12:00–15:00, 18:00–20:00 Mar 12 05:00–08:00, 13:00–15:00 Mar 13 05:00–07:00, 13:00–16:00 Mar 14 05:00–08:00, 13:00–16:00 Mar 15 05:00–08:00, 13:00–15:00 Mar 16 05:00–09:00, 12:00–15:00 Mar 17 05:00–09:00, 12:00–15:00 Mar 18 05:00–08:00, 12:00–15:00 Mar 19 06:00–09:00, 12:00–15:00 Mar 20 13:00–16:00, 20:00–21:00 Mar 21 04:00–08:00, 14:00–18:00 Mar 22 07:00–10:00, 14:00–17:00 Mar 23 12:00–18:00 Mar 24 05:00–08:00, 13:00–17:00 Mar 25 06:00–10:00 Mar 26 05:00–08:00, 13:00–16:00 Mar 27 06:00–09:00, 12:00–17:00 Mar 28 06:00–09:00, 13:00–17:00 Mar 29 13:00–16:00 Mar 30 12:00–15:00 Mar 31 05:00–09:00, 12:00–17:00
April
Apr 1 05:00–09:00, 13:00–16:00 Apr 2 06:00–09:00, 13:00–16:00 Apr 3 13:00–16:00 Apr 4 07:00–10:00 Apr 5 09:00–20:00 Apr 6 12:00–14:00 Apr 7 11:00–18:00 Apr 8 06:00–07:00, 12:00–17:00 Apr 9 05:00–09:00, 12:00–15:00 Apr 10 06:00–09:00 Apr 11 07:00–10:00, 13:00–16:00 Apr 12 13:00–17:00 Apr 13 12:00–15:00 Apr 14 06:00–09:00, 12:00–15:00 Apr 15 05:00–09:00, 12:00–14:00 Apr 16 06:00–09:00, 12:00–15:00 Apr 17 06:00–09:00, 12:00–15:00 Apr 18 06:00–09:00, 13:00–16:00 Apr 19 08:00–10:00, 13:00–17:00 Apr 21 05:00–08:00, 14:00–16:00 Apr 22 07:00–08:00, 14:00–17:00 Apr 23 06:00–09:00, 14:00–16:00 Apr 24 05:00–08:00, 12:00–17:00 Apr 25 12:00–18:00 Apr 26 07:00–09:00, 14:00–18:00 Apr 27 07:00–09:00, 13:00–15:00 Apr 28 06:00–09:00, 14:00–15:00 Apr 29 07:00–10:00, 14:00–16:00 Apr 30 06:00–08:00, 14:00–18:00
May
May 2 08:00–10:00 May 3 06:00–09:00, 15:00–17:00 May 4 06:00–09:00 May 5 12:00–16:00 May 6 06:00–08:00, 12:00–18:00 May 7 06:00–08:00, 11:00–16:00 May 8 05:00–08:00, 12:00–16:00 May 9 08:00–11:00, 14:00–17:00 May 10 04:00–08:00, 12:00–15:00 May 11 05:00–09:00, 12:00–14:00 May 12 05:00–08:00, 11:00–16:00 May 14 05:00–09:00, 11:00–14:00 May 15 05:00–06:00, 12:00–14:00 May 17 04:00–08:00, 12:00–16:00 May 18 05:00–09:00, 12:00–16:00 May 19 05:00–09:00, 12:00–17:00 May 20 07:00–09:00, 12:00–14:00 May 21 05:00–08:00, 11:00–13:00 May 22 09:00–10:00, 12:00–15:00 May 23 06:00–09:00, 14:00–15:00 May 25 05:00–09:00, 11:00–16:00 May 26 11:00–15:00 May 27 11:00–14:00 May 28 05:00–08:00, 12:00–14:00 May 29 05:00–08:00, 11:00–15:00 May 30 12:00–16:00
June
Jun 1 04:00–06:00 Jun 2 05:00–07:00, 11:00–13:00 Jun 3 05:00–08:00, 11:00–14:00 Jun 4 05:00–08:00, 11:00–15:00 Jun 5 05:00–08:00 Jun 7 06:00–09:00, 12:00–15:00 Jun 8 05:00–09:00, 12:00–15:00 Jun 9 12:00–16:00 Jun 10 05:00–09:00, 12:00–15:00 Jun 11 05:00–09:00, 12:00–15:00 Jun 12 05:00–09:00 Jun 13 06:00–09:00 Jun 15 05:00–08:00, 12:00–14:00 Jun 17 05:00–09:00, 11:00–15:00 Jun 18 05:00–08:00, 10:00–16:00 Jun 19 05:00–15:00 Jun 20 05:00–07:00, 13:00–17:00 Jun 21 04:00–08:00, 14:00–16:00 Jun 22 10:00–15:00 Jun 23 05:00–08:00, 11:00–14:00 Jun 24 05:00–07:00, 11:00–13:00 Jun 25 05:00–08:00 Jun 26 05:00–09:00, 11:00–14:00 Jun 27 11:00–14:00 Jun 28 04:00–09:00, 11:00–14:00 Jun 29 05:00–07:00, 11:00–15:00 Jun 30 05:00–08:00, 11:00–13:00
July
Jul 2 05:00–13:00 Jul 3 06:00–10:00 Jul 4 05:00–10:00 Jul 5 05:00–09:00 Jul 6 05:00–08:00, 11:00–13:00 Jul 7 12:00–14:00 Jul 8 05:00–07:00 Jul 9 05:00–08:00, 12:00–14:00 Jul 10 05:00–09:00, 11:00–14:00 Jul 11 11:00–13:00 Jul 12 04:00–08:00 Jul 13 05:00–08:00, 11:00–13:00 Jul 14 05:00–06:00 Jul 15 06:00–09:00 Jul 16 05:00–09:00, 11:00–14:00 Jul 17 05:00–09:00, 11:00–13:00 Jul 18 06:00–09:00 Jul 20 05:00–08:00, 11:00–14:00 Jul 21 05:00–13:00 Jul 22 05:00–10:00 Jul 23 05:00–11:00 Jul 24 05:00–14:00 Jul 25 06:00–10:00 Jul 27 05:00–10:00