Most often in June, 28 days.
Highest follower count seen that year: 25,287.
January
Jan 7 20:00–23:00 Jan 13 21:00–24:00 Jan 14 03:00–11:00, 20:00–24:00 Jan 15 00:00–11:00, 13:00–24:00 Jan 16 00:00–03:00, 13:00–24:00 Jan 17 00:00–11:00, 20:00–24:00 Jan 18 00:00–03:00 Jan 19 05:00–10:00, 13:00–24:00 Jan 20 00:00–03:00, 13:00–24:00 Jan 21 00:00–11:00, 19:00–24:00 Jan 22 00:00–11:00, 13:00–24:00 Jan 23 00:00–10:00, 13:00–24:00 Jan 24 00:00–11:00, 21:00–24:00 Jan 25 00:00–03:00 Jan 26 03:00–11:00, 20:00–24:00 Jan 27 00:00–11:00, 13:00–24:00 Jan 28 00:00–02:00, 05:00–06:00, 19:00–24:00 Jan 29 00:00–11:00, 13:00–24:00 Jan 30 00:00–11:00, 22:00–24:00 Jan 31 00:00–05:00, 19:00–24:00
February
Feb 1 01:00–02:00 Feb 2 04:00–10:00, 21:00–23:00 Feb 3 00:00–04:00, 15:00–24:00 Feb 4 00:00–03:00, 05:00–11:00 Feb 5 20:00–24:00 Feb 6 00:00–11:00, 13:00–24:00 Feb 7 00:00–03:00, 18:00–24:00 Feb 8 00:00–02:00, 05:00–09:00 Feb 9 04:00–10:00, 13:00–24:00 Feb 10 00:00–02:00, 18:00–24:00 Feb 11 00:00–02:00, 04:00–09:00, 13:00–19:00 Feb 13 18:00–24:00 Feb 14 00:00–03:00, 20:00–24:00 Feb 15 05:00–08:00, 12:00–13:00 Feb 16 15:00–21:00 Feb 17 04:00–10:00, 13:00–19:00, 23:00–24:00 Feb 18 00:00–03:00, 13:00–20:00 Feb 19 04:00–09:00 Feb 20 13:00–19:00 Feb 21 13:00–19:00 Feb 23 04:00–10:00 Feb 24 13:00–20:00 Feb 25 04:00–10:00, 13:00–20:00 Feb 26 14:00–20:00 Feb 27 13:00–24:00 Feb 28 00:00–03:00, 13:00–20:00
March
Mar 2 12:00–19:00 Mar 3 04:00–05:00, 13:00–19:00 Mar 4 04:00–08:00, 12:00–19:00 Mar 5 15:00–20:00 Mar 6 12:00–19:00 Mar 9 14:00–19:00 Mar 10 03:00–04:00, 13:00–19:00 Mar 11 13:00–24:00 Mar 12 00:00–07:00, 13:00–18:00 Mar 15 01:00–02:00 Mar 17 21:00–24:00 Mar 18 00:00–08:00, 20:00–24:00 Mar 19 01:00–06:00, 20:00–24:00 Mar 20 00:00–02:00, 13:00–19:00 Mar 21 22:00–24:00 Mar 22 00:00–03:00 Mar 23 22:00–24:00 Mar 25 03:00–08:00, 21:00–24:00 Mar 26 00:00–10:00, 20:00–24:00 Mar 27 00:00–03:00, 23:00–24:00 Mar 28 00:00–03:00, 20:00–24:00 Mar 29 00:00–03:00, 05:00–10:00, 12:00–20:00 Mar 30 21:00–24:00 Mar 31 00:00–04:00, 21:00–24:00
April
Apr 1 00:00–02:00, 20:00–24:00 Apr 2 00:00–01:00 Apr 9 22:00–24:00 Apr 10 00:00–03:00, 13:00–19:00 Apr 11 12:00–13:00 Apr 14 14:00–24:00 Apr 15 00:00–03:00, 05:00–09:00, 14:00–18:00, 20:00–24:00 Apr 16 00:00–02:00, 21:00–24:00 Apr 17 00:00–05:00, 14:00–24:00 Apr 18 00:00–03:00, 20:00–24:00 Apr 20 05:00–12:00, 14:00–20:00, 22:00–24:00 Apr 21 00:00–03:00, 05:00–10:00, 14:00–24:00 Apr 22 00:00–01:00, 09:00–11:00, 21:00–24:00 Apr 23 00:00–05:00, 14:00–19:00, 21:00–24:00 Apr 24 00:00–24:00 Apr 25 00:00–04:00, 06:00–15:00, 20:00–24:00 Apr 26 00:00–03:00, 15:00–19:00 Apr 27 08:00–11:00, 13:00–24:00 Apr 28 00:00–05:00, 13:00–24:00 Apr 29 00:00–04:00, 14:00–24:00 Apr 30 00:00–01:00, 14:00–24:00
May
May 1 00:00–04:00, 22:00–24:00 May 2 00:00–03:00, 19:00–20:00, 23:00–24:00 May 4 13:00–19:00, 22:00–24:00 May 5 00:00–03:00, 13:00–20:00, 22:00–24:00 May 6 01:00–02:00, 13:00–24:00 May 7 00:00–04:00, 20:00–21:00 May 8 13:00–19:00, 22:00–24:00 May 9 03:00–04:00, 16:00–19:00, 22:00–24:00 May 10 00:00–01:00, 13:00–19:00 May 11 13:00–24:00 May 12 00:00–03:00, 13:00–24:00 May 13 01:00–04:00, 13:00–24:00 May 14 00:00–02:00, 14:00–19:00 May 15 13:00–14:00, 16:00–23:00 May 16 00:00–03:00 May 19 14:00–19:00, 22:00–24:00 May 20 00:00–03:00, 14:00–22:00 May 21 01:00–04:00, 20:00–22:00 May 22 20:00–21:00, 23:00–24:00 May 23 00:00–03:00, 21:00–24:00 May 24 00:00–01:00 May 25 14:00–19:00, 21:00–24:00 May 26 00:00–01:00, 04:00–08:00, 14:00–20:00 May 27 14:00–19:00, 22:00–24:00 May 28 00:00–02:00, 04:00–11:00, 21:00–24:00 May 29 00:00–02:00, 05:00–11:00, 14:00–19:00, 21:00–24:00 May 30 00:00–10:00, 15:00–18:00, 22:00–24:00 May 31 00:00–03:00, 14:00–17:00
June
Jun 1 03:00–10:00, 22:00–24:00 Jun 2 04:00–08:00, 13:00–24:00 Jun 3 00:00–01:00, 13:00–19:00, 21:00–24:00 Jun 4 01:00–02:00, 04:00–10:00, 15:00–24:00 Jun 5 00:00–03:00, 05:00–11:00, 23:00–24:00 Jun 6 00:00–04:00, 15:00–20:00, 22:00–24:00 Jun 7 00:00–01:00 Jun 9 22:00–24:00 Jun 10 00:00–04:00, 15:00–20:00, 23:00–24:00 Jun 11 00:00–03:00, 23:00–24:00 Jun 12 00:00–03:00, 14:00–19:00, 22:00–24:00 Jun 13 00:00–02:00, 05:00–12:00 Jun 15 20:00–24:00 Jun 16 00:00–03:00, 05:00–11:00, 14:00–24:00 Jun 17 00:00–12:00, 20:00–24:00 Jun 18 14:00–23:00 Jun 19 01:00–02:00, 15:00–18:00, 20:00–23:00 Jun 20 00:00–03:00, 14:00–23:00 Jun 21 00:00–02:00 Jun 22 22:00–24:00 Jun 23 15:00–19:00, 22:00–24:00 Jun 24 00:00–02:00, 05:00–11:00, 21:00–24:00 Jun 25 00:00–08:00, 15:00–24:00 Jun 26 00:00–03:00, 19:00–24:00 Jun 27 00:00–03:00, 22:00–24:00 Jun 28 00:00–01:00 Jun 29 22:00–24:00 Jun 30 00:00–03:00, 05:00–10:00, 22:00–24:00
July
Jul 1 00:00–03:00, 06:00–11:00, 16:00–19:00, 21:00–24:00 Jul 2 20:00–24:00 Jul 3 05:00–09:00 Jul 4 21:00–24:00 Jul 6 14:00–19:00 Jul 7 15:00–19:00 Jul 8 01:00–03:00 Jul 10 15:00–20:00, 22:00–24:00 Jul 11 00:00–01:00 Jul 14 14:00–19:00 Jul 15 22:00–24:00 Jul 16 00:00–02:00, 14:00–24:00 Jul 17 01:00–02:00 Jul 18 20:00–24:00 Jul 19 00:00–03:00, 13:00–17:00 Jul 20 22:00–24:00 Jul 21 00:00–02:00, 22:00–24:00 Jul 22 00:00–03:00, 15:00–24:00 Jul 24 22:00–24:00 Jul 25 00:00–05:00, 13:00–19:00, 21:00–24:00 Jul 26 00:00–02:00