Most often in January, 28 days.
Highest follower count seen that year: 12,256.
January
Jan 1 23:00–24:00 Jan 2 00:00–01:00, 11:00–16:00, 20:00–21:00 Jan 3 01:00–04:00, 16:00–22:00 Jan 5 15:00–24:00 Jan 6 00:00–01:00, 03:00–04:00, 17:00–21:00 Jan 7 00:00–06:00, 15:00–17:00, 23:00–24:00 Jan 8 00:00–01:00, 16:00–18:00, 22:00–24:00 Jan 9 03:00–05:00 Jan 10 03:00–04:00 Jan 11 16:00–17:00, 22:00–23:00 Jan 12 00:00–01:00, 15:00–17:00, 21:00–23:00 Jan 13 00:00–01:00, 13:00–16:00, 22:00–24:00 Jan 14 00:00–02:00, 16:00–18:00, 23:00–24:00 Jan 15 00:00–01:00, 05:00–06:00, 14:00–17:00, 22:00–24:00 Jan 16 00:00–01:00, 15:00–17:00, 22:00–24:00 Jan 17 03:00–05:00 Jan 19 17:00–18:00, 21:00–22:00 Jan 20 00:00–01:00, 15:00–16:00, 21:00–22:00 Jan 21 01:00–04:00, 15:00–19:00, 21:00–24:00 Jan 22 13:00–14:00 Jan 23 02:00–04:00, 16:00–22:00 Jan 24 02:00–03:00, 14:00–17:00 Jan 26 17:00–20:00 Jan 27 00:00–01:00, 16:00–17:00, 19:00–23:00 Jan 28 01:00–05:00, 15:00–18:00 Jan 29 01:00–04:00, 16:00–19:00 Jan 30 03:00–04:00, 16:00–17:00, 22:00–24:00 Jan 31 00:00–01:00, 15:00–17:00, 23:00–24:00
February
Feb 1 00:00–01:00, 18:00–19:00 Feb 2 23:00–24:00 Feb 3 13:00–15:00, 19:00–22:00 Feb 4 04:00–05:00, 15:00–16:00, 19:00–21:00, 23:00–24:00 Feb 5 00:00–03:00, 13:00–14:00, 23:00–24:00 Feb 6 00:00–01:00, 15:00–16:00, 20:00–24:00 Feb 7 00:00–03:00, 15:00–16:00, 19:00–22:00 Feb 8 00:00–01:00 Feb 9 11:00–15:00, 19:00–20:00, 22:00–24:00 Feb 10 00:00–03:00, 14:00–15:00, 18:00–19:00 Feb 11 04:00–05:00, 17:00–18:00, 23:00–24:00 Feb 12 00:00–03:00 Feb 13 04:00–05:00, 15:00–16:00 Feb 14 12:00–14:00 Feb 15 22:00–23:00 Feb 17 22:00–23:00 Feb 18 18:00–19:00 Feb 22 23:00–24:00 Feb 23 04:00–05:00, 10:00–15:00, 18:00–19:00, 22:00–23:00 Feb 24 00:00–03:00, 17:00–20:00 Feb 25 03:00–05:00, 11:00–18:00, 22:00–24:00 Feb 26 13:00–16:00, 21:00–22:00 Feb 27 01:00–03:00, 11:00–16:00, 18:00–21:00, 23:00–24:00 Feb 28 00:00–01:00, 04:00–06:00, 13:00–16:00, 19:00–20:00
March
Mar 2 20:00–24:00 Mar 3 01:00–03:00, 09:00–10:00 Mar 4 13:00–17:00 Mar 5 15:00–17:00, 22:00–23:00 Mar 6 14:00–17:00, 20:00–23:00 Mar 7 01:00–03:00, 12:00–15:00, 23:00–24:00 Mar 9 13:00–16:00, 19:00–20:00, 22:00–24:00 Mar 10 00:00–01:00, 03:00–05:00, 11:00–12:00, 15:00–17:00, 19:00–21:00 Mar 11 03:00–04:00, 14:00–16:00, 20:00–21:00, 23:00–24:00 Mar 12 00:00–01:00, 11:00–15:00, 23:00–24:00 Mar 13 00:00–01:00, 14:00–19:00, 23:00–24:00 Mar 14 00:00–03:00, 12:00–15:00, 20:00–21:00 Mar 16 13:00–15:00, 18:00–21:00 Mar 17 13:00–14:00, 16:00–17:00, 19:00–22:00 Mar 18 23:00–24:00 Mar 19 01:00–02:00, 11:00–14:00, 18:00–22:00 Mar 20 00:00–01:00, 12:00–15:00, 21:00–23:00 Mar 21 01:00–03:00, 14:00–17:00 Mar 23 16:00–17:00, 21:00–24:00 Mar 24 01:00–02:00, 21:00–23:00 Mar 25 14:00–15:00, 21:00–24:00 Mar 26 01:00–03:00, 14:00–15:00, 23:00–24:00 Mar 27 02:00–03:00, 11:00–15:00 Mar 30 17:00–18:00, 22:00–23:00 Mar 31 02:00–03:00, 11:00–14:00, 20:00–21:00
April
Apr 1 14:00–20:00 Apr 2 17:00–18:00, 23:00–24:00 Apr 4 15:00–16:00 Apr 7 13:00–14:00 Apr 8 03:00–04:00, 14:00–17:00, 22:00–23:00 Apr 9 01:00–02:00, 15:00–17:00 Apr 10 13:00–14:00, 16:00–17:00 Apr 11 15:00–18:00 Apr 13 15:00–21:00 Apr 14 02:00–03:00, 11:00–13:00, 15:00–17:00, 19:00–21:00 Apr 15 21:00–23:00 Apr 16 11:00–13:00, 17:00–18:00, 21:00–24:00 Apr 17 14:00–19:00, 22:00–24:00 Apr 18 02:00–04:00, 14:00–15:00, 17:00–18:00 Apr 20 12:00–16:00, 19:00–21:00 Apr 22 13:00–14:00 Apr 24 13:00–14:00, 19:00–20:00, 22:00–24:00 Apr 25 00:00–01:00, 12:00–15:00 Apr 27 13:00–15:00, 18:00–19:00, 22:00–23:00 Apr 28 00:00–01:00, 11:00–16:00, 19:00–24:00 Apr 29 00:00–01:00, 11:00–13:00, 19:00–24:00 Apr 30 13:00–16:00, 20:00–21:00, 23:00–24:00
May
May 1 00:00–03:00, 13:00–17:00, 19:00–20:00 May 4 21:00–22:00 May 5 14:00–17:00, 21:00–22:00 May 6 02:00–03:00, 16:00–18:00, 22:00–24:00 May 8 13:00–15:00, 22:00–24:00 May 9 14:00–16:00 May 11 13:00–15:00 May 12 13:00–15:00, 23:00–24:00 May 13 00:00–01:00, 20:00–24:00 May 14 14:00–15:00, 23:00–24:00 May 15 13:00–14:00, 16:00–17:00, 19:00–21:00 May 16 00:00–02:00, 14:00–17:00 May 17 18:00–19:00, 21:00–24:00 May 18 00:00–03:00, 11:00–13:00, 20:00–24:00 May 19 06:00–07:00, 11:00–15:00, 18:00–19:00 May 20 00:00–01:00, 17:00–18:00, 20:00–21:00 May 21 11:00–13:00, 18:00–19:00 May 22 12:00–16:00, 21:00–22:00 May 23 16:00–18:00 May 25 14:00–16:00, 21:00–24:00 May 26 17:00–18:00, 21:00–24:00 May 27 00:00–02:00, 14:00–15:00, 20:00–24:00 May 28 00:00–04:00, 14:00–18:00 May 29 03:00–04:00, 13:00–17:00, 21:00–24:00 May 30 03:00–05:00, 15:00–16:00, 21:00–22:00 May 31 12:00–15:00
June
Jun 1 00:00–02:00, 21:00–24:00 Jun 2 00:00–01:00, 11:00–13:00, 21:00–22:00 Jun 3 01:00–02:00, 13:00–14:00, 22:00–24:00 Jun 4 00:00–03:00, 15:00–17:00, 22:00–23:00 Jun 5 00:00–01:00 Jun 8 12:00–19:00, 22:00–24:00 Jun 9 02:00–04:00, 12:00–13:00, 20:00–23:00 Jun 10 15:00–17:00 Jun 11 00:00–03:00, 15:00–21:00 Jun 12 00:00–03:00, 10:00–12:00, 17:00–18:00, 20:00–21:00 Jun 13 00:00–02:00, 13:00–17:00 Jun 15 08:00–09:00, 11:00–13:00, 20:00–24:00 Jun 16 13:00–18:00, 21:00–24:00 Jun 17 00:00–01:00, 13:00–14:00, 16:00–17:00, 21:00–22:00 Jun 18 02:00–03:00, 12:00–18:00, 22:00–24:00 Jun 19 11:00–13:00, 15:00–17:00 Jun 20 19:00–20:00 Jun 21 14:00–16:00, 22:00–23:00 Jun 22 00:00–02:00, 20:00–21:00 Jun 23 18:00–21:00, 23:00–24:00 Jun 24 01:00–03:00, 13:00–14:00, 19:00–22:00 Jun 25 10:00–13:00, 19:00–21:00, 23:00–24:00 Jun 26 11:00–16:00, 20:00–22:00 Jun 27 14:00–16:00 Jun 29 23:00–24:00 Jun 30 16:00–17:00
July
Jul 2 18:00–19:00 Jul 3 01:00–04:00, 14:00–16:00, 21:00–22:00 Jul 4 15:00–18:00 Jul 5 03:00–04:00, 15:00–18:00 Jul 6 13:00–15:00, 21:00–24:00 Jul 7 00:00–01:00, 22:00–23:00 Jul 8 14:00–15:00 Jul 9 01:00–03:00, 12:00–13:00, 21:00–22:00 Jul 10 00:00–01:00, 12:00–19:00 Jul 11 13:00–15:00, 23:00–24:00 Jul 13 15:00–18:00, 23:00–24:00 Jul 14 00:00–01:00, 11:00–14:00, 17:00–20:00 Jul 15 00:00–01:00 Jul 16 01:00–03:00, 12:00–18:00, 23:00–24:00 Jul 17 12:00–18:00 Jul 18 12:00–13:00, 16:00–17:00 Jul 20 13:00–17:00 Jul 21 15:00–18:00, 22:00–23:00 Jul 22 12:00–14:00, 23:00–24:00 Jul 23 00:00–01:00, 13:00–16:00, 20:00–21:00 Jul 24 01:00–04:00, 15:00–18:00 Jul 25 21:00–23:00 Jul 26 11:00–13:00