Most often in May, 28 days.
Highest follower count seen that year: 10,425.
January
Jan 1 15:00–18:00, 20:00–22:00 Jan 2 08:00–16:00, 18:00–23:00 Jan 3 00:00–01:00, 06:00–16:00, 18:00–21:00, 23:00–24:00 Jan 4 07:00–10:00, 13:00–19:00, 21:00–22:00 Jan 5 23:00–24:00 Jan 6 00:00–01:00, 12:00–14:00 Jan 7 09:00–10:00, 13:00–14:00 Jan 8 20:00–23:00 Jan 10 12:00–16:00 Jan 11 04:00–07:00, 09:00–17:00 Jan 12 14:00–16:00, 18:00–20:00 Jan 13 15:00–16:00, 19:00–21:00 Jan 14 20:00–23:00 Jan 15 03:00–04:00 Jan 17 05:00–07:00 Jan 18 16:00–17:00, 19:00–22:00 Jan 19 04:00–05:00 Jan 20 13:00–14:00, 18:00–19:00 Jan 22 07:00–09:00, 11:00–12:00 Jan 23 06:00–10:00, 12:00–14:00, 16:00–17:00 Jan 24 08:00–11:00, 19:00–24:00 Jan 25 12:00–15:00, 17:00–20:00 Jan 26 16:00–19:00 Jan 27 17:00–18:00, 21:00–22:00 Jan 28 16:00–19:00 Jan 31 07:00–13:00, 16:00–18:00, 20:00–21:00, 23:00–24:00
February
Feb 1 09:00–15:00, 18:00–20:00 Feb 2 17:00–18:00, 20:00–21:00 Feb 3 19:00–22:00 Feb 4 17:00–21:00 Feb 6 16:00–18:00, 22:00–23:00 Feb 7 00:00–01:00, 07:00–09:00, 11:00–14:00, 17:00–20:00 Feb 8 11:00–14:00, 16:00–20:00 Feb 10 17:00–18:00, 20:00–22:00 Feb 12 20:00–23:00 Feb 13 05:00–06:00, 16:00–18:00, 20:00–24:00 Feb 14 00:00–01:00, 06:00–11:00, 13:00–14:00, 17:00–18:00 Feb 15 09:00–13:00, 15:00–17:00 Feb 17 19:00–20:00 Feb 19 17:00–19:00 Feb 20 03:00–06:00, 17:00–19:00, 22:00–24:00 Feb 21 00:00–01:00, 04:00–07:00, 10:00–11:00 Feb 24 01:00–03:00 Feb 27 16:00–17:00 Feb 28 03:00–07:00, 09:00–14:00
March
Mar 1 13:00–23:00 Mar 2 16:00–17:00 Mar 4 18:00–19:00 Mar 6 10:00–11:00, 13:00–14:00 Mar 7 15:00–19:00 Mar 8 09:00–15:00, 18:00–19:00 Mar 10 16:00–17:00, 21:00–23:00 Mar 11 16:00–19:00 Mar 12 17:00–20:00 Mar 15 14:00–15:00, 17:00–20:00 Mar 17 16:00–17:00, 19:00–22:00 Mar 18 15:00–16:00, 18:00–21:00 Mar 19 16:00–17:00 Mar 21 12:00–14:00, 16:00–23:00 Mar 22 10:00–15:00 Mar 24 16:00–20:00 Mar 25 16:00–18:00, 20:00–23:00 Mar 26 04:00–06:00, 16:00–22:00 Mar 27 08:00–13:00, 19:00–24:00 Mar 28 03:00–08:00, 10:00–11:00 Mar 29 10:00–13:00, 17:00–24:00 Mar 30 00:00–02:00, 07:00–10:00, 12:00–13:00, 17:00–18:00 Mar 31 07:00–10:00
April
Apr 1 16:00–18:00 Apr 4 08:00–12:00, 14:00–18:00, 20:00–24:00 Apr 5 00:00–02:00, 06:00–11:00 Apr 7 18:00–22:00 Apr 8 05:00–06:00, 15:00–17:00, 20:00–22:00 Apr 9 14:00–15:00 Apr 13 15:00–19:00 Apr 15 17:00–23:00 Apr 17 17:00–22:00 Apr 18 06:00–08:00, 11:00–13:00 Apr 19 05:00–11:00 Apr 21 17:00–18:00 Apr 22 03:00–06:00, 16:00–21:00 Apr 23 02:00–06:00 Apr 25 10:00–13:00, 15:00–23:00 Apr 26 03:00–05:00, 07:00–11:00, 15:00–18:00 Apr 28 16:00–19:00 Apr 30 14:00–18:00
May
May 1 06:00–10:00, 13:00–20:00 May 2 06:00–08:00, 11:00–12:00 May 3 11:00–17:00, 21:00–23:00 May 4 05:00–06:00, 16:00–20:00 May 5 04:00–06:00, 17:00–20:00 May 8 17:00–18:00, 20:00–24:00 May 9 00:00–01:00, 05:00–06:00, 08:00–09:00, 11:00–12:00, 17:00–20:00 May 10 06:00–09:00, 11:00–17:00 May 11 02:00–04:00, 16:00–17:00, 20:00–21:00 May 12 07:00–11:00, 15:00–20:00 May 13 04:00–05:00, 16:00–17:00, 20:00–21:00 May 14 03:00–06:00, 19:00–23:00 May 15 03:00–07:00 May 16 15:00–18:00 May 17 09:00–12:00, 15:00–16:00, 18:00–19:00 May 19 03:00–04:00 May 20 16:00–18:00, 20:00–21:00 May 21 04:00–06:00, 18:00–19:00, 21:00–22:00 May 22 06:00–07:00, 18:00–21:00 May 23 09:00–12:00, 16:00–19:00 May 24 09:00–16:00, 19:00–20:00 May 25 16:00–18:00, 20:00–21:00 May 26 04:00–06:00, 16:00–18:00, 20:00–23:00 May 27 04:00–05:00, 17:00–18:00 May 28 04:00–06:00, 16:00–18:00, 23:00–24:00 May 29 00:00–02:00 May 30 04:00–06:00 May 31 09:00–13:00, 16:00–17:00
June
Jun 1 13:00–14:00 Jun 3 06:00–07:00 Jun 5 07:00–08:00, 15:00–16:00 Jun 6 05:00–09:00, 15:00–22:00 Jun 7 09:00–18:00 Jun 8 05:00–07:00, 19:00–24:00 Jun 9 07:00–08:00, 17:00–18:00, 20:00–21:00 Jun 10 00:00–01:00, 06:00–07:00, 17:00–18:00 Jun 11 00:00–03:00, 17:00–19:00, 22:00–23:00 Jun 12 06:00–08:00, 19:00–20:00 Jun 13 03:00–06:00, 10:00–14:00, 16:00–18:00 Jun 15 05:00–07:00 Jun 16 05:00–07:00 Jun 17 17:00–18:00 Jun 18 03:00–05:00 Jun 19 18:00–20:00 Jun 22 16:00–22:00 Jun 23 17:00–23:00 Jun 24 06:00–08:00, 17:00–21:00 Jun 25 04:00–07:00 Jun 26 17:00–20:00 Jun 27 05:00–07:00, 11:00–12:00, 14:00–16:00, 19:00–24:00 Jun 28 08:00–12:00 Jun 29 18:00–24:00 Jun 30 08:00–11:00, 15:00–18:00
July
Jul 1 18:00–24:00 Jul 2 18:00–20:00 Jul 3 04:00–07:00, 17:00–23:00 Jul 4 06:00–10:00, 12:00–15:00, 17:00–24:00 Jul 5 00:00–02:00, 09:00–10:00, 13:00–14:00, 16:00–20:00 Jul 6 03:00–06:00 Jul 8 01:00–04:00, 06:00–07:00, 19:00–20:00 Jul 10 16:00–22:00 Jul 11 04:00–06:00, 09:00–13:00, 17:00–19:00 Jul 13 18:00–20:00 Jul 14 03:00–07:00, 18:00–20:00 Jul 15 18:00–23:00 Jul 17 19:00–24:00 Jul 18 00:00–01:00, 07:00–09:00, 12:00–15:00, 20:00–22:00 Jul 19 01:00–02:00, 05:00–07:00, 10:00–11:00 Jul 20 03:00–06:00 Jul 21 17:00–18:00 Jul 22 06:00–07:00, 19:00–20:00, 23:00–24:00