Most often in March, 28 days.
Highest follower count seen that year: 895.
February
Feb 28 06:00–16:00
March
Mar 1 14:00–24:00 Mar 2 00:00–04:00, 06:00–07:00, 18:00–24:00 Mar 3 00:00–04:00, 19:00–24:00 Mar 4 00:00–05:00, 16:00–22:00 Mar 5 01:00–03:00, 13:00–21:00 Mar 6 08:00–11:00, 20:00–24:00 Mar 7 00:00–04:00, 14:00–21:00 Mar 8 05:00–16:00 Mar 9 13:00–20:00 Mar 10 21:00–24:00 Mar 11 00:00–04:00, 14:00–16:00, 18:00–21:00 Mar 12 23:00–24:00 Mar 13 00:00–04:00, 11:00–17:00 Mar 14 07:00–11:00 Mar 15 06:00–12:00 Mar 16 06:00–10:00 Mar 17 12:00–16:00, 18:00–20:00 Mar 18 13:00–18:00 Mar 19 11:00–18:00 Mar 20 14:00–21:00 Mar 21 13:00–19:00 Mar 22 12:00–20:00 Mar 23 16:00–22:00 Mar 24 12:00–16:00, 18:00–21:00 Mar 25 13:00–21:00 Mar 26 13:00–14:00, 20:00–21:00 Mar 27 14:00–16:00 Mar 28 05:00–10:00, 12:00–13:00, 16:00–22:00
April
Apr 4 09:00–10:00, 16:00–18:00 Apr 6 17:00–19:00, 21:00–22:00 Apr 7 13:00–17:00 Apr 8 13:00–19:00 Apr 9 14:00–16:00 Apr 10 13:00–21:00 Apr 11 07:00–16:00 Apr 12 13:00–17:00, 19:00–22:00 Apr 13 14:00–19:00 Apr 14 14:00–21:00 Apr 15 13:00–20:00 Apr 16 00:00–03:00, 07:00–10:00 Apr 19 17:00–24:00 Apr 20 00:00–03:00, 15:00–22:00 Apr 21 01:00–04:00, 21:00–24:00 Apr 22 00:00–04:00, 14:00–20:00 Apr 23 20:00–24:00 Apr 24 00:00–01:00, 13:00–21:00 Apr 25 05:00–16:00 Apr 26 05:00–16:00 Apr 27 05:00–16:00 Apr 28 22:00–24:00 Apr 29 00:00–04:00, 06:00–08:00, 22:00–23:00 Apr 30 00:00–11:00, 14:00–15:00
May
May 1 00:00–03:00, 13:00–16:00 May 3 01:00–02:00, 10:00–18:00 May 4 06:00–13:00, 21:00–24:00 May 5 03:00–04:00, 18:00–22:00 May 6 02:00–04:00, 19:00–24:00 May 7 03:00–05:00, 17:00–20:00 May 8 18:00–24:00 May 9 03:00–04:00, 17:00–23:00 May 10 02:00–05:00, 17:00–24:00 May 11 16:00–20:00 May 12 04:00–12:00 May 13 16:00–20:00 May 14 12:00–17:00, 19:00–20:00 May 15 06:00–08:00 May 16 12:00–19:00, 22:00–23:00 May 17 18:00–24:00 May 18 17:00–24:00 May 19 00:00–03:00, 13:00–20:00 May 20 15:00–20:00 May 21 16:00–22:00 May 22 16:00–24:00 May 23 00:00–04:00, 17:00–19:00, 22:00–24:00 May 24 00:00–04:00, 17:00–24:00 May 25 00:00–03:00, 17:00–24:00 May 26 00:00–04:00, 18:00–24:00 May 27 00:00–04:00, 18:00–24:00 May 28 00:00–03:00
June
Jun 1 02:00–14:00 Jun 2 05:00–16:00 Jun 3 05:00–14:00 Jun 4 06:00–15:00 Jun 5 07:00–17:00 Jun 6 07:00–16:00 Jun 7 06:00–15:00 Jun 8 07:00–16:00 Jun 9 06:00–10:00, 12:00–16:00 Jun 10 07:00–15:00 Jun 11 06:00–12:00 Jun 12 06:00–07:00, 09:00–12:00 Jun 17 17:00–23:00 Jun 18 06:00–15:00, 18:00–19:00 Jun 19 05:00–07:00, 11:00–16:00 Jun 20 06:00–11:00 Jun 21 11:00–12:00 Jun 22 13:00–24:00 Jun 23 17:00–21:00 Jun 24 00:00–04:00, 18:00–21:00 Jun 25 19:00–24:00 Jun 26 00:00–04:00, 18:00–24:00 Jun 27 00:00–02:00, 18:00–19:00, 22:00–23:00 Jun 28 20:00–24:00 Jun 29 17:00–21:00 Jun 30 00:00–03:00
July
Jul 1 07:00–10:00 Jul 2 04:00–09:00, 15:00–16:00 Jul 3 06:00–11:00, 13:00–15:00 Jul 4 06:00–13:00 Jul 5 07:00–13:00, 20:00–21:00 Jul 6 06:00–16:00 Jul 9 06:00–08:00, 13:00–16:00 Jul 10 06:00–10:00, 12:00–17:00 Jul 11 06:00–11:00, 14:00–15:00 Jul 12 06:00–11:00, 13:00–17:00 Jul 13 06:00–14:00 Jul 14 07:00–13:00, 16:00–17:00 Jul 15 14:00–17:00 Jul 17 19:00–21:00, 23:00–24:00 Jul 18 00:00–01:00, 05:00–06:00, 19:00–23:00 Jul 19 03:00–04:00, 20:00–21:00 Jul 20 06:00–07:00, 09:00–10:00 Jul 21 03:00–05:00, 17:00–24:00 Jul 22 00:00–04:00, 23:00–24:00 Jul 23 00:00–01:00, 07:00–08:00 Jul 24 03:00–04:00 Jul 25 00:00–02:00, 19:00–24:00 Jul 26 00:00–01:00, 19:00–24:00 Jul 27 00:00–02:00 Jul 30 17:00–24:00 Jul 31 00:00–02:00