Most often in February, 28 days.
Highest follower count seen that year: 6,189.
January
Jan 1 18:00–21:00 Jan 2 04:00–05:00, 13:00–19:00 Jan 3 04:00–08:00, 12:00–13:00, 17:00–20:00 Jan 4 04:00–06:00, 11:00–12:00, 19:00–21:00 Jan 5 04:00–09:00 Jan 6 09:00–12:00, 19:00–22:00 Jan 7 07:00–08:00 Jan 8 09:00–11:00, 20:00–21:00 Jan 9 06:00–07:00, 15:00–22:00 Jan 10 05:00–08:00, 13:00–15:00, 21:00–22:00 Jan 11 05:00–08:00, 14:00–16:00, 19:00–21:00 Jan 12 04:00–07:00, 18:00–21:00 Jan 13 05:00–10:00 Jan 20 05:00–08:00, 14:00–16:00, 19:00–21:00 Jan 21 05:00–08:00, 19:00–21:00 Jan 22 06:00–08:00, 14:00–18:00 Jan 24 10:00–12:00, 19:00–21:00 Jan 25 05:00–08:00, 11:00–15:00, 19:00–20:00 Jan 26 04:00–06:00, 14:00–16:00, 19:00–22:00 Jan 27 05:00–07:00, 14:00–16:00, 18:00–20:00 Jan 28 19:00–21:00 Jan 29 18:00–23:00 Jan 30 05:00–07:00, 12:00–16:00, 19:00–23:00 Jan 31 07:00–12:00, 18:00–19:00
February
Feb 1 14:00–18:00 Feb 2 05:00–09:00, 21:00–22:00 Feb 3 05:00–13:00, 20:00–22:00 Feb 4 07:00–08:00 Feb 5 05:00–07:00 Feb 6 17:00–18:00 Feb 7 19:00–21:00 Feb 8 05:00–07:00, 13:00–17:00, 21:00–22:00 Feb 9 08:00–11:00, 17:00–19:00 Feb 10 06:00–09:00, 13:00–18:00, 20:00–22:00 Feb 11 08:00–13:00 Feb 12 05:00–09:00, 14:00–16:00, 19:00–21:00 Feb 13 05:00–08:00 Feb 14 06:00–09:00, 15:00–17:00 Feb 15 13:00–16:00, 19:00–21:00 Feb 16 10:00–13:00, 20:00–22:00 Feb 17 09:00–11:00, 20:00–22:00 Feb 18 05:00–08:00 Feb 19 20:00–22:00 Feb 20 08:00–09:00, 20:00–21:00 Feb 21 06:00–09:00, 12:00–16:00 Feb 22 08:00–09:00, 17:00–21:00 Feb 23 09:00–12:00, 18:00–21:00 Feb 24 05:00–09:00, 13:00–14:00 Feb 25 06:00–08:00, 14:00–15:00, 20:00–21:00 Feb 26 05:00–08:00, 13:00–16:00, 20:00–22:00 Feb 27 08:00–10:00, 14:00–17:00, 20:00–23:00 Feb 28 10:00–12:00
March
Mar 2 06:00–11:00, 16:00–18:00 Mar 4 08:00–10:00, 18:00–20:00 Mar 5 09:00–12:00, 19:00–22:00 Mar 7 17:00–21:00 Mar 8 08:00–12:00, 18:00–22:00 Mar 9 09:00–14:00, 19:00–22:00 Mar 10 08:00–14:00 Mar 11 12:00–15:00, 19:00–21:00 Mar 12 07:00–10:00, 15:00–21:00 Mar 13 06:00–10:00, 14:00–16:00, 20:00–22:00 Mar 14 03:00–04:00 Mar 16 09:00–12:00, 19:00–22:00 Mar 17 05:00–09:00 Mar 18 09:00–12:00, 19:00–22:00 Mar 19 06:00–07:00, 13:00–17:00 Mar 21 22:00–23:00 Mar 22 10:00–13:00, 20:00–22:00 Mar 23 07:00–10:00, 14:00–16:00, 20:00–22:00 Mar 24 08:00–12:00, 19:00–20:00 Mar 25 06:00–09:00, 15:00–18:00, 20:00–21:00 Mar 26 07:00–11:00 Mar 27 14:00–21:00 Mar 28 08:00–10:00, 13:00–14:00, 18:00–21:00 Mar 29 05:00–09:00, 13:00–15:00, 20:00–22:00 Mar 30 05:00–08:00, 11:00–14:00, 21:00–22:00 Mar 31 05:00–07:00
April
Apr 1 17:00–21:00 Apr 2 05:00–07:00 Apr 4 05:00–10:00, 18:00–23:00 Apr 5 06:00–09:00 Apr 6 18:00–21:00 Apr 7 05:00–06:00, 08:00–09:00, 16:00–23:00 Apr 8 06:00–09:00, 15:00–16:00, 20:00–22:00 Apr 9 05:00–08:00 Apr 10 05:00–08:00, 12:00–15:00, 19:00–21:00 Apr 11 19:00–22:00 Apr 12 09:00–11:00, 16:00–22:00 Apr 13 11:00–16:00, 20:00–22:00 Apr 14 06:00–08:00, 12:00–15:00, 19:00–23:00 Apr 15 06:00–10:00 Apr 18 08:00–10:00, 16:00–21:00 Apr 19 05:00–07:00, 12:00–15:00 Apr 20 12:00–15:00, 19:00–22:00 Apr 21 07:00–10:00, 17:00–20:00 Apr 22 06:00–09:00, 18:00–22:00 Apr 23 17:00–21:00 Apr 24 05:00–08:00, 14:00–17:00, 20:00–22:00 Apr 25 13:00–16:00, 19:00–21:00 Apr 26 12:00–14:00, 20:00–21:00 Apr 27 08:00–10:00, 20:00–22:00 Apr 28 18:00–22:00 Apr 29 07:00–09:00, 14:00–15:00, 20:00–24:00 Apr 30 11:00–13:00, 21:00–22:00
May
May 2 10:00–11:00 May 10 06:00–08:00, 15:00–16:00, 19:00–20:00 May 11 06:00–10:00, 19:00–22:00 May 12 02:00–04:00, 12:00–15:00 May 13 03:00–05:00, 19:00–21:00 May 14 03:00–04:00, 09:00–12:00, 18:00–20:00 May 15 03:00–05:00, 10:00–12:00, 15:00–16:00, 19:00–20:00 May 16 09:00–11:00 May 18 19:00–20:00 May 19 06:00–08:00, 19:00–21:00 May 20 04:00–07:00, 10:00–12:00, 15:00–17:00 May 21 05:00–07:00 May 23 04:00–07:00, 14:00–17:00 May 24 07:00–09:00, 14:00–16:00 May 25 05:00–07:00, 15:00–17:00, 19:00–21:00 May 26 08:00–11:00 May 27 09:00–10:00 May 28 19:00–22:00 May 29 08:00–12:00 May 30 04:00–08:00, 18:00–21:00 May 31 03:00–07:00, 13:00–14:00
June
Jun 6 14:00–16:00 Jun 7 04:00–06:00, 15:00–16:00, 20:00–22:00 Jun 8 06:00–10:00, 15:00–17:00, 19:00–21:00 Jun 9 05:00–06:00, 08:00–12:00 Jun 11 17:00–22:00 Jun 12 03:00–08:00, 20:00–22:00 Jun 13 10:00–16:00 Jun 17 10:00–13:00 Jun 18 15:00–18:00 Jun 19 14:00–16:00 Jun 20 17:00–21:00 Jun 21 12:00–15:00 Jun 22 03:00–11:00, 18:00–21:00 Jun 23 06:00–11:00, 18:00–21:00 Jun 24 04:00–08:00, 13:00–15:00, 19:00–22:00 Jun 25 04:00–07:00, 13:00–16:00, 20:00–21:00 Jun 26 06:00–08:00, 13:00–16:00, 20:00–21:00 Jun 27 20:00–21:00 Jun 28 19:00–22:00 Jun 29 06:00–09:00, 13:00–16:00, 19:00–21:00 Jun 30 08:00–10:00, 15:00–17:00, 19:00–21:00
July
Jul 1 07:00–09:00, 19:00–21:00 Jul 3 19:00–22:00 Jul 4 18:00–19:00 Jul 5 19:00–21:00 Jul 6 05:00–11:00, 18:00–22:00 Jul 7 07:00–09:00, 14:00–16:00 Jul 8 05:00–10:00, 14:00–15:00, 19:00–22:00 Jul 9 07:00–12:00, 15:00–20:00 Jul 10 14:00–15:00, 18:00–22:00 Jul 11 18:00–22:00 Jul 12 12:00–14:00, 18:00–22:00 Jul 13 07:00–12:00, 19:00–21:00 Jul 14 07:00–13:00, 19:00–22:00 Jul 15 08:00–11:00, 20:00–22:00 Jul 16 19:00–22:00 Jul 17 13:00–14:00, 20:00–22:00 Jul 21 05:00–07:00, 14:00–15:00, 19:00–23:00 Jul 22 14:00–16:00, 19:00–21:00 Jul 23 05:00–08:00 Jul 24 00:00–02:00, 08:00–12:00, 15:00–22:00 Jul 25 09:00–11:00, 19:00–21:00 Jul 26 11:00–14:00, 19:00–21:00 Jul 27 05:00–07:00, 08:00–11:00