Most often in January, 30 days.
Highest follower count seen that year: 1,917.
January
Jan 1 18:00–23:00 Jan 2 08:00–12:00, 20:00–22:00 Jan 3 02:00–05:00, 15:00–20:00 Jan 4 04:00–08:00 Jan 5 08:00–10:00 Jan 6 07:00–09:00, 17:00–18:00 Jan 7 07:00–09:00, 17:00–21:00 Jan 8 07:00–09:00, 16:00–17:00 Jan 9 07:00–13:00, 17:00–21:00 Jan 10 05:00–09:00, 14:00–21:00 Jan 11 05:00–09:00, 11:00–12:00, 15:00–20:00 Jan 12 06:00–08:00, 16:00–21:00 Jan 13 20:00–24:00 Jan 14 00:00–01:00, 19:00–21:00 Jan 15 05:00–07:00, 09:00–10:00, 19:00–21:00 Jan 16 06:00–12:00, 18:00–21:00 Jan 17 05:00–06:00, 13:00–14:00, 16:00–23:00 Jan 18 05:00–10:00, 18:00–23:00 Jan 19 17:00–22:00 Jan 20 07:00–08:00, 15:00–22:00 Jan 21 18:00–22:00 Jan 23 03:00–07:00 Jan 24 18:00–20:00 Jan 25 05:00–07:00, 14:00–18:00 Jan 26 08:00–11:00, 17:00–19:00 Jan 27 07:00–08:00, 13:00–15:00, 19:00–23:00 Jan 28 16:00–22:00 Jan 29 07:00–08:00 Jan 30 12:00–13:00, 18:00–21:00 Jan 31 05:00–11:00
February
Feb 1 10:00–14:00, 18:00–20:00 Feb 2 06:00–09:00, 19:00–20:00 Feb 3 16:00–20:00 Feb 4 16:00–23:00 Feb 6 18:00–22:00 Feb 7 06:00–09:00, 18:00–21:00 Feb 8 08:00–13:00, 16:00–22:00 Feb 9 18:00–20:00 Feb 10 08:00–13:00, 18:00–21:00 Feb 11 05:00–07:00 Feb 12 07:00–11:00, 19:00–22:00 Feb 13 11:00–12:00, 18:00–22:00 Feb 14 07:00–10:00, 17:00–18:00 Feb 15 15:00–17:00 Feb 16 17:00–20:00 Feb 17 09:00–13:00, 15:00–20:00 Feb 18 18:00–21:00 Feb 19 17:00–20:00 Feb 20 07:00–09:00, 11:00–12:00, 18:00–23:00 Feb 21 09:00–11:00 Feb 22 09:00–10:00, 13:00–15:00, 19:00–21:00 Feb 23 11:00–12:00, 18:00–24:00 Feb 24 00:00–01:00, 11:00–12:00, 19:00–20:00 Feb 25 18:00–20:00 Feb 26 10:00–12:00, 15:00–16:00, 20:00–24:00 Feb 27 11:00–12:00, 18:00–21:00 Feb 28 05:00–06:00, 16:00–17:00, 20:00–23:00
March
Mar 1 08:00–13:00, 20:00–23:00 Mar 3 19:00–21:00 Mar 4 07:00–08:00, 11:00–12:00, 19:00–22:00 Mar 5 08:00–09:00, 11:00–13:00, 16:00–22:00 Mar 6 11:00–12:00, 14:00–16:00, 20:00–24:00 Mar 7 00:00–01:00, 08:00–11:00, 20:00–23:00 Mar 8 09:00–12:00, 21:00–23:00 Mar 9 08:00–10:00, 22:00–24:00 Mar 10 20:00–22:00 Mar 11 20:00–23:00 Mar 12 10:00–13:00, 21:00–23:00 Mar 13 10:00–13:00, 16:00–17:00, 20:00–23:00 Mar 14 07:00–09:00, 20:00–21:00 Mar 15 08:00–10:00, 13:00–15:00, 19:00–20:00 Mar 16 19:00–21:00 Mar 17 12:00–13:00, 20:00–22:00 Mar 18 09:00–10:00, 16:00–17:00, 20:00–23:00 Mar 20 04:00–05:00, 20:00–22:00 Mar 21 10:00–11:00, 18:00–19:00 Mar 22 10:00–14:00, 19:00–22:00 Mar 24 18:00–22:00 Mar 25 09:00–10:00, 12:00–13:00, 19:00–21:00 Mar 26 10:00–11:00, 17:00–22:00 Mar 27 10:00–12:00, 18:00–20:00 Mar 28 07:00–09:00
April
Apr 4 10:00–13:00, 18:00–20:00 Apr 5 13:00–16:00, 19:00–22:00 Apr 6 15:00–20:00 Apr 7 19:00–20:00 Apr 8 16:00–21:00 Apr 10 11:00–12:00, 16:00–21:00 Apr 11 15:00–19:00 Apr 12 11:00–12:00, 18:00–21:00 Apr 13 10:00–12:00, 16:00–18:00, 20:00–24:00 Apr 14 00:00–01:00, 10:00–12:00, 20:00–23:00 Apr 15 17:00–21:00 Apr 16 17:00–20:00 Apr 17 11:00–13:00, 16:00–22:00 Apr 18 19:00–23:00 Apr 20 11:00–12:00, 16:00–22:00 Apr 21 10:00–12:00, 17:00–20:00 Apr 22 08:00–10:00, 16:00–20:00, 22:00–23:00 Apr 23 10:00–13:00, 18:00–21:00 Apr 24 10:00–11:00, 19:00–22:00 Apr 25 16:00–20:00 Apr 26 19:00–21:00 Apr 27 12:00–13:00, 20:00–23:00 Apr 28 10:00–11:00, 17:00–21:00 Apr 29 16:00–21:00 Apr 30 17:00–22:00
May
May 1 18:00–21:00 May 3 10:00–11:00, 19:00–20:00 May 4 16:00–20:00 May 5 16:00–19:00 May 6 20:00–21:00 May 7 08:00–09:00, 20:00–21:00 May 8 18:00–22:00 May 9 17:00–21:00 May 10 09:00–10:00, 19:00–21:00 May 11 19:00–21:00 May 23 15:00–16:00, 18:00–19:00 May 24 09:00–11:00, 19:00–23:00 May 25 16:00–20:00 May 26 09:00–11:00 May 27 19:00–21:00 May 28 10:00–11:00, 19:00–21:00 May 30 12:00–14:00, 16:00–19:00 May 31 17:00–21:00
June
Jun 3 07:00–08:00, 20:00–22:00 Jun 5 18:00–22:00 Jun 6 18:00–22:00 Jun 7 19:00–22:00 Jun 8 20:00–22:00 Jun 9 20:00–21:00 Jun 10 19:00–22:00 Jun 11 19:00–22:00 Jun 12 20:00–23:00