Most often in March, 30 days.
Highest follower count seen that year: 3,461.
January
Jan 6 21:00–24:00 Jan 7 00:00–01:00, 11:00–24:00 Jan 8 00:00–01:00, 11:00–20:00 Jan 9 00:00–01:00, 13:00–18:00 Jan 10 19:00–20:00, 22:00–24:00 Jan 11 17:00–18:00 Jan 12 13:00–16:00, 20:00–24:00 Jan 13 09:00–11:00, 14:00–16:00, 21:00–24:00 Jan 14 00:00–04:00, 21:00–24:00 Jan 15 00:00–01:00, 08:00–10:00, 22:00–24:00 Jan 16 00:00–03:00, 16:00–24:00 Jan 17 00:00–03:00, 15:00–17:00, 19:00–24:00 Jan 18 00:00–02:00, 18:00–23:00 Jan 19 14:00–16:00, 18:00–24:00 Jan 20 15:00–24:00 Jan 21 00:00–01:00, 13:00–16:00, 20:00–24:00 Jan 22 00:00–01:00, 17:00–24:00 Jan 23 00:00–02:00, 17:00–24:00 Jan 24 14:00–18:00, 20:00–24:00 Jan 25 12:00–20:00 Jan 26 15:00–18:00, 21:00–24:00 Jan 27 15:00–16:00, 19:00–21:00, 23:00–24:00 Jan 28 00:00–02:00, 11:00–20:00, 22:00–23:00 Jan 29 11:00–12:00, 14:00–18:00, 23:00–24:00 Jan 30 11:00–14:00, 16:00–18:00, 22:00–23:00 Jan 31 11:00–24:00
February
Feb 1 00:00–02:00, 11:00–15:00, 19:00–24:00 Feb 2 00:00–01:00, 09:00–12:00, 23:00–24:00 Feb 3 00:00–01:00 Feb 4 11:00–16:00, 20:00–24:00 Feb 5 00:00–01:00, 18:00–19:00 Feb 6 10:00–13:00, 22:00–23:00 Feb 7 00:00–05:00, 23:00–24:00 Feb 8 00:00–07:00, 22:00–24:00 Feb 9 00:00–03:00, 11:00–15:00, 21:00–22:00 Feb 10 00:00–04:00, 11:00–13:00, 20:00–24:00 Feb 11 00:00–05:00, 16:00–19:00, 22:00–24:00 Feb 12 00:00–06:00, 21:00–24:00 Feb 13 00:00–06:00, 10:00–12:00, 23:00–24:00 Feb 14 00:00–03:00, 11:00–22:00 Feb 15 01:00–05:00, 16:00–17:00, 19:00–24:00 Feb 16 01:00–06:00, 16:00–20:00 Feb 17 11:00–15:00, 18:00–24:00 Feb 18 00:00–06:00, 22:00–24:00 Feb 19 00:00–04:00, 21:00–24:00 Feb 20 00:00–06:00, 12:00–13:00, 22:00–24:00 Feb 21 00:00–05:00, 23:00–24:00 Feb 22 00:00–05:00, 12:00–14:00, 17:00–19:00, 23:00–24:00 Feb 23 00:00–05:00, 17:00–20:00, 22:00–24:00 Feb 24 00:00–05:00 Feb 28 19:00–21:00, 23:00–24:00
March
Mar 1 00:00–08:00, 20:00–24:00 Mar 2 00:00–05:00, 19:00–24:00 Mar 3 02:00–05:00, 22:00–24:00 Mar 4 00:00–05:00, 08:00–14:00 Mar 5 01:00–04:00, 12:00–22:00 Mar 6 00:00–03:00, 12:00–16:00 Mar 7 00:00–04:00, 10:00–12:00, 19:00–20:00, 22:00–24:00 Mar 8 00:00–04:00, 22:00–24:00 Mar 9 00:00–01:00, 22:00–24:00 Mar 10 00:00–05:00, 09:00–12:00, 22:00–24:00 Mar 11 00:00–04:00, 22:00–24:00 Mar 12 00:00–04:00, 22:00–24:00 Mar 13 00:00–05:00, 21:00–24:00 Mar 14 09:00–10:00, 22:00–24:00 Mar 15 00:00–05:00, 09:00–10:00, 22:00–24:00 Mar 16 00:00–04:00, 21:00–23:00 Mar 17 00:00–03:00, 21:00–23:00 Mar 18 02:00–05:00, 22:00–24:00 Mar 19 00:00–05:00, 23:00–24:00 Mar 20 00:00–02:00, 09:00–11:00, 22:00–24:00 Mar 21 00:00–05:00, 10:00–11:00, 21:00–24:00 Mar 22 00:00–05:00, 21:00–24:00 Mar 23 00:00–04:00, 22:00–24:00 Mar 24 11:00–13:00, 23:00–24:00 Mar 25 00:00–04:00, 21:00–23:00 Mar 26 02:00–05:00, 23:00–24:00 Mar 27 00:00–05:00, 23:00–24:00 Mar 28 00:00–05:00 Mar 29 21:00–24:00 Mar 30 00:00–05:00
April
Apr 2 00:00–03:00 Apr 4 01:00–02:00, 16:00–24:00 Apr 5 00:00–03:00, 10:00–11:00, 16:00–19:00, 21:00–23:00 Apr 6 08:00–14:00, 16:00–19:00, 23:00–24:00 Apr 7 00:00–01:00, 03:00–06:00 Apr 8 12:00–18:00, 21:00–22:00 Apr 9 00:00–05:00 Apr 10 00:00–06:00, 10:00–14:00, 16:00–20:00 Apr 11 03:00–05:00 Apr 12 23:00–24:00 Apr 13 00:00–04:00 Apr 18 22:00–24:00 Apr 19 00:00–01:00, 15:00–17:00, 22:00–24:00 Apr 20 00:00–03:00 Apr 21 22:00–24:00 Apr 22 00:00–05:00, 21:00–24:00 Apr 23 00:00–05:00, 23:00–24:00 Apr 24 02:00–04:00, 22:00–24:00 Apr 25 00:00–02:00, 22:00–24:00 Apr 26 00:00–02:00, 05:00–06:00, 22:00–23:00 Apr 27 01:00–05:00, 22:00–24:00 Apr 28 00:00–05:00, 22:00–24:00 Apr 29 00:00–05:00, 22:00–24:00 Apr 30 00:00–04:00, 22:00–24:00
May
May 1 00:00–05:00, 22:00–24:00 May 2 00:00–05:00 May 3 00:00–05:00, 22:00–24:00 May 4 00:00–01:00, 22:00–24:00 May 5 00:00–03:00, 22:00–24:00 May 6 00:00–05:00, 22:00–24:00 May 7 00:00–05:00, 09:00–10:00 May 9 19:00–24:00 May 10 00:00–05:00, 07:00–09:00, 19:00–24:00 May 11 00:00–04:00, 20:00–23:00 May 12 00:00–04:00, 20:00–24:00 May 13 00:00–04:00, 20:00–21:00, 23:00–24:00 May 14 00:00–01:00, 21:00–23:00 May 15 02:00–03:00, 21:00–23:00 May 16 01:00–02:00, 21:00–24:00 May 17 00:00–03:00, 21:00–24:00 May 18 00:00–05:00, 20:00–24:00 May 19 00:00–06:00, 21:00–24:00 May 20 00:00–06:00, 21:00–22:00 May 21 01:00–04:00 May 22 02:00–04:00 May 23 02:00–05:00, 22:00–24:00 May 24 00:00–04:00, 21:00–22:00 May 25 01:00–03:00 May 27 03:00–04:00, 09:00–12:00, 22:00–24:00 May 28 00:00–05:00, 09:00–12:00, 23:00–24:00 May 29 00:00–04:00 May 30 22:00–24:00 May 31 00:00–05:00, 22:00–24:00
June
Jun 1 00:00–04:00, 22:00–24:00 Jun 2 00:00–02:00, 22:00–24:00 Jun 3 00:00–05:00, 23:00–24:00 Jun 4 01:00–06:00, 23:00–24:00 Jun 5 00:00–02:00, 04:00–06:00 Jun 6 00:00–01:00, 23:00–24:00 Jun 7 01:00–06:00 Jun 8 00:00–06:00, 21:00–24:00 Jun 9 00:00–06:00 Jun 10 23:00–24:00 Jun 11 00:00–06:00, 22:00–24:00 Jun 12 00:00–05:00, 09:00–10:00, 22:00–24:00 Jun 13 01:00–06:00, 09:00–12:00 Jun 15 02:00–05:00, 21:00–24:00 Jun 16 00:00–06:00, 22:00–24:00 Jun 17 00:00–05:00, 22:00–24:00 Jun 18 21:00–24:00 Jun 19 00:00–05:00, 21:00–23:00 Jun 20 00:00–05:00, 22:00–24:00 Jun 21 00:00–05:00, 21:00–24:00 Jun 22 00:00–05:00, 23:00–24:00 Jun 23 09:00–10:00, 23:00–24:00 Jun 24 21:00–22:00 Jun 25 00:00–01:00, 03:00–05:00, 08:00–09:00, 23:00–24:00 Jun 26 00:00–05:00, 23:00–24:00 Jun 27 03:00–05:00, 08:00–09:00, 22:00–24:00 Jun 28 22:00–24:00 Jun 29 00:00–05:00, 23:00–24:00 Jun 30 08:00–10:00, 22:00–24:00
July
Jul 1 00:00–02:00, 23:00–24:00 Jul 3 22:00–23:00 Jul 4 22:00–24:00 Jul 5 00:00–05:00, 22:00–23:00 Jul 6 08:00–12:00, 15:00–16:00, 22:00–23:00 Jul 7 22:00–24:00 Jul 8 00:00–03:00 Jul 9 22:00–24:00 Jul 10 00:00–06:00, 22:00–24:00 Jul 11 00:00–05:00, 22:00–24:00 Jul 12 00:00–05:00, 10:00–14:00, 17:00–19:00, 21:00–24:00 Jul 13 00:00–03:00, 23:00–24:00 Jul 14 00:00–04:00, 23:00–24:00 Jul 15 00:00–03:00, 22:00–24:00 Jul 16 00:00–05:00, 22:00–24:00 Jul 17 00:00–04:00, 14:00–17:00 Jul 19 22:00–24:00 Jul 20 00:00–04:00 Jul 21 01:00–04:00, 22:00–24:00 Jul 22 00:00–04:00, 23:00–24:00 Jul 23 00:00–08:00 Jul 24 01:00–05:00 Jul 25 00:00–04:00, 22:00–24:00 Jul 26 00:00–05:00, 22:00–24:00 Jul 27 00:00–02:00 Jul 30 21:00–24:00 Jul 31 00:00–04:00