Most often in March, 31 days.
Highest follower count seen that year: 60,673.
January
Jan 2 20:00–24:00 Jan 3 00:00–01:00, 06:00–09:00, 20:00–24:00 Jan 4 07:00–09:00, 20:00–24:00 Jan 5 00:00–01:00, 20:00–23:00 Jan 6 05:00–09:00, 20:00–24:00 Jan 7 15:00–17:00, 20:00–23:00 Jan 8 05:00–07:00, 20:00–24:00 Jan 9 00:00–03:00, 20:00–24:00 Jan 10 00:00–03:00, 20:00–24:00 Jan 11 00:00–02:00, 06:00–08:00, 20:00–24:00 Jan 12 00:00–03:00, 20:00–24:00 Jan 13 00:00–02:00, 20:00–24:00 Jan 14 00:00–02:00, 20:00–24:00 Jan 15 00:00–02:00, 20:00–24:00 Jan 16 00:00–02:00, 20:00–24:00 Jan 17 20:00–24:00 Jan 18 00:00–02:00, 20:00–23:00 Jan 19 00:00–02:00, 20:00–24:00 Jan 20 00:00–01:00, 07:00–08:00, 21:00–24:00 Jan 21 00:00–02:00, 20:00–24:00 Jan 22 00:00–01:00, 20:00–24:00 Jan 23 00:00–02:00, 21:00–24:00 Jan 24 20:00–24:00 Jan 25 00:00–01:00, 22:00–24:00 Jan 26 00:00–03:00, 20:00–23:00 Jan 27 06:00–09:00, 20:00–23:00 Jan 28 06:00–09:00, 20:00–22:00 Jan 30 06:00–08:00, 20:00–24:00 Jan 31 00:00–01:00, 20:00–24:00
February
Feb 1 06:00–08:00, 20:00–24:00 Feb 2 00:00–02:00, 20:00–24:00 Feb 3 06:00–08:00, 20:00–23:00 Feb 4 07:00–09:00, 20:00–24:00 Feb 5 00:00–02:00, 06:00–07:00, 20:00–24:00 Feb 6 05:00–09:00, 19:00–22:00 Feb 7 06:00–07:00, 20:00–24:00 Feb 8 00:00–01:00, 19:00–24:00 Feb 9 00:00–01:00, 20:00–24:00 Feb 10 00:00–01:00, 19:00–23:00 Feb 11 06:00–07:00, 20:00–24:00 Feb 12 00:00–01:00, 20:00–24:00 Feb 13 07:00–08:00, 20:00–24:00 Feb 14 00:00–02:00, 06:00–07:00, 20:00–24:00 Feb 15 00:00–01:00, 06:00–08:00, 20:00–24:00 Feb 16 06:00–07:00, 20:00–24:00 Feb 17 06:00–07:00, 20:00–22:00 Feb 19 05:00–08:00, 20:00–23:00 Feb 20 00:00–01:00, 06:00–08:00, 20:00–24:00 Feb 21 00:00–01:00, 06:00–07:00, 19:00–24:00 Feb 22 05:00–07:00, 20:00–23:00 Feb 23 06:00–08:00, 19:00–24:00 Feb 24 06:00–07:00, 20:00–22:00 Feb 25 06:00–07:00, 20:00–24:00 Feb 26 00:00–01:00, 06:00–07:00, 20:00–24:00 Feb 27 06:00–08:00, 20:00–24:00 Feb 28 00:00–01:00, 06:00–08:00, 20:00–22:00
March
Mar 1 07:00–08:00, 19:00–23:00 Mar 2 06:00–07:00 Mar 3 20:00–24:00 Mar 4 00:00–01:00, 06:00–07:00, 20:00–24:00 Mar 5 00:00–01:00, 05:00–07:00, 20:00–24:00 Mar 6 06:00–07:00, 20:00–23:00 Mar 7 05:00–08:00, 19:00–24:00 Mar 8 05:00–08:00, 20:00–24:00 Mar 9 06:00–08:00, 20:00–22:00 Mar 10 06:00–08:00, 19:00–24:00 Mar 11 06:00–08:00, 20:00–22:00 Mar 12 06:00–07:00, 20:00–23:00 Mar 13 06:00–08:00, 20:00–23:00 Mar 14 06:00–07:00, 20:00–23:00 Mar 15 06:00–07:00, 20:00–24:00 Mar 16 00:00–01:00, 06:00–07:00, 20:00–23:00 Mar 17 06:00–08:00 Mar 18 06:00–07:00, 20:00–23:00 Mar 19 06:00–08:00, 20:00–23:00 Mar 20 06:00–08:00, 20:00–23:00 Mar 21 20:00–24:00 Mar 22 05:00–07:00, 19:00–24:00 Mar 23 20:00–24:00 Mar 24 19:00–21:00 Mar 25 06:00–08:00, 20:00–24:00 Mar 26 00:00–01:00, 20:00–24:00 Mar 27 06:00–07:00, 14:00–15:00, 20:00–24:00 Mar 28 12:00–14:00, 19:00–24:00 Mar 29 00:00–01:00, 06:00–07:00, 20:00–24:00 Mar 30 00:00–01:00, 20:00–24:00 Mar 31 06:00–07:00, 20:00–24:00
April
Apr 1 00:00–02:00, 20:00–24:00 Apr 2 00:00–01:00, 06:00–07:00, 19:00–22:00 Apr 3 05:00–07:00 Apr 4 19:00–24:00 Apr 5 00:00–01:00, 19:00–23:00 Apr 6 06:00–07:00, 20:00–24:00 Apr 7 00:00–01:00, 06:00–08:00, 19:00–23:00 Apr 8 05:00–07:00, 20:00–24:00 Apr 9 00:00–01:00, 22:00–24:00 Apr 10 00:00–01:00, 20:00–22:00 Apr 11 06:00–07:00, 20:00–23:00 Apr 12 06:00–08:00, 20:00–22:00 Apr 13 05:00–07:00, 20:00–22:00 Apr 14 20:00–24:00 Apr 15 00:00–02:00, 13:00–15:00, 20:00–23:00 Apr 16 20:00–24:00 Apr 17 00:00–02:00, 20:00–23:00 Apr 18 06:00–07:00, 20:00–24:00 Apr 19 00:00–01:00, 06:00–08:00, 19:00–23:00 Apr 20 20:00–24:00 Apr 21 00:00–01:00, 06:00–07:00, 20:00–24:00 Apr 22 06:00–07:00, 20:00–24:00 Apr 23 00:00–01:00, 07:00–08:00, 20:00–23:00 Apr 24 14:00–16:00, 20:00–24:00 Apr 25 00:00–01:00, 12:00–14:00, 20:00–24:00 Apr 26 00:00–01:00, 06:00–09:00, 20:00–23:00 Apr 27 20:00–23:00 Apr 28 06:00–09:00, 20:00–22:00 Apr 29 05:00–07:00, 20:00–23:00 Apr 30 06:00–09:00, 20:00–23:00
May
May 1 06:00–09:00, 20:00–24:00 May 2 06:00–09:00, 21:00–24:00 May 3 00:00–02:00, 07:00–10:00, 21:00–24:00 May 4 05:00–07:00 May 7 20:00–21:00 May 8 06:00–08:00, 20:00–23:00 May 9 07:00–10:00, 20:00–22:00 May 10 06:00–08:00, 20:00–22:00 May 11 06:00–08:00, 20:00–21:00 May 12 06:00–08:00, 20:00–23:00 May 13 06:00–09:00, 13:00–15:00, 20:00–22:00 May 14 06:00–08:00, 20:00–23:00 May 15 05:00–07:00, 21:00–22:00 May 16 06:00–08:00, 12:00–14:00, 21:00–23:00 May 17 06:00–07:00, 10:00–11:00, 20:00–23:00 May 18 06:00–10:00, 20:00–21:00 May 19 06:00–08:00, 20:00–23:00 May 20 06:00–07:00, 15:00–17:00, 20:00–22:00 May 21 06:00–07:00, 20:00–22:00 May 22 06:00–09:00, 14:00–16:00, 20:00–24:00 May 23 00:00–01:00, 21:00–24:00 May 24 00:00–01:00, 20:00–24:00 May 25 00:00–01:00, 15:00–17:00, 20:00–23:00 May 26 20:00–24:00 May 27 17:00–18:00, 21:00–24:00 May 28 00:00–01:00, 06:00–08:00, 20:00–23:00 May 29 06:00–07:00, 21:00–24:00 May 30 05:00–07:00, 21:00–23:00 May 31 06:00–07:00, 19:00–21:00
June
Jun 1 05:00–06:00, 20:00–23:00 Jun 2 05:00–07:00, 20:00–24:00 Jun 3 20:00–23:00 Jun 4 20:00–22:00 Jun 5 06:00–07:00, 20:00–23:00 Jun 6 20:00–23:00 Jun 7 06:00–09:00, 20:00–24:00 Jun 8 06:00–08:00, 20:00–23:00 Jun 9 20:00–23:00 Jun 10 16:00–17:00, 21:00–23:00 Jun 11 06:00–07:00, 20:00–23:00 Jun 12 20:00–24:00 Jun 15 06:00–08:00, 20:00–22:00 Jun 16 05:00–07:00, 20:00–23:00 Jun 17 05:00–08:00, 20:00–22:00 Jun 18 06:00–07:00, 09:00–10:00, 20:00–24:00 Jun 19 20:00–23:00 Jun 20 05:00–07:00, 20:00–23:00 Jun 21 06:00–08:00, 20:00–24:00 Jun 22 00:00–01:00, 20:00–24:00 Jun 23 06:00–10:00, 22:00–24:00 Jun 24 20:00–23:00 Jun 25 06:00–07:00, 20:00–24:00 Jun 26 20:00–24:00 Jun 27 05:00–07:00, 20:00–24:00 Jun 28 00:00–01:00, 06:00–07:00, 20:00–24:00 Jun 29 05:00–06:00, 20:00–24:00
July
Jul 1 20:00–22:00 Jul 2 20:00–23:00 Jul 3 06:00–07:00, 20:00–22:00 Jul 4 20:00–24:00 Jul 5 20:00–24:00 Jul 6 06:00–07:00, 20:00–24:00 Jul 7 06:00–07:00, 20:00–24:00 Jul 8 06:00–08:00, 13:00–15:00, 20:00–24:00 Jul 9 08:00–09:00, 21:00–23:00 Jul 10 06:00–08:00, 15:00–17:00, 21:00–24:00 Jul 11 00:00–01:00, 06:00–07:00, 13:00–15:00, 20:00–24:00 Jul 12 00:00–01:00, 06:00–07:00, 20:00–24:00 Jul 13 00:00–01:00, 06:00–08:00, 20:00–22:00 Jul 14 21:00–23:00 Jul 15 14:00–15:00, 20:00–24:00 Jul 16 15:00–16:00, 20:00–22:00 Jul 17 21:00–23:00 Jul 18 06:00–08:00, 21:00–24:00 Jul 19 00:00–01:00, 22:00–23:00 Jul 20 08:00–10:00, 22:00–23:00 Jul 21 13:00–15:00, 21:00–24:00 Jul 22 14:00–16:00, 21:00–23:00 Jul 23 07:00–08:00, 22:00–24:00 Jul 24 00:00–01:00, 22:00–24:00 Jul 25 09:00–10:00, 21:00–23:00 Jul 26 07:00–10:00, 20:00–24:00 Jul 27 06:00–07:00, 14:00–16:00, 20:00–21:00