Most often in April, 25 days.
Highest follower count seen that year: 3,239.
January
Jan 6 05:00–07:00, 15:00–18:00 Jan 7 20:00–24:00 Jan 8 00:00–05:00, 21:00–22:00 Jan 9 00:00–06:00, 15:00–18:00 Jan 10 04:00–07:00, 15:00–19:00 Jan 11 04:00–05:00, 15:00–20:00 Jan 12 15:00–17:00 Jan 13 04:00–06:00, 16:00–20:00 Jan 14 03:00–06:00, 16:00–19:00 Jan 15 14:00–18:00, 20:00–21:00 Jan 16 04:00–06:00, 15:00–18:00 Jan 17 03:00–06:00, 14:00–18:00 Jan 18 02:00–03:00, 14:00–18:00 Jan 24 02:00–03:00, 15:00–18:00 Jan 25 00:00–01:00, 17:00–18:00 Jan 26 15:00–18:00 Jan 27 03:00–06:00, 15:00–17:00 Jan 28 15:00–18:00 Jan 29 00:00–02:00, 16:00–18:00 Jan 30 23:00–24:00 Jan 31 00:00–01:00, 17:00–20:00
February
Feb 1 04:00–07:00, 17:00–24:00 Feb 2 00:00–01:00 Feb 3 15:00–18:00 Feb 4 03:00–05:00, 16:00–19:00 Feb 5 02:00–04:00, 15:00–17:00 Feb 6 03:00–05:00, 17:00–19:00 Feb 7 03:00–06:00, 16:00–18:00 Feb 8 02:00–05:00, 16:00–19:00 Feb 9 16:00–17:00 Feb 10 03:00–05:00, 18:00–19:00 Feb 11 03:00–05:00, 15:00–18:00 Feb 12 01:00–06:00, 15:00–18:00 Feb 13 03:00–06:00, 15:00–19:00 Feb 14 02:00–08:00, 17:00–19:00, 21:00–22:00 Feb 15 04:00–09:00, 16:00–18:00 Feb 16 05:00–06:00 Feb 17 04:00–07:00 Feb 18 04:00–07:00 Feb 20 04:00–07:00 Feb 24 00:00–05:00, 17:00–19:00 Feb 25 04:00–07:00, 14:00–16:00 Feb 26 03:00–04:00, 16:00–18:00 Feb 27 04:00–07:00, 16:00–18:00 Feb 28 03:00–06:00, 16:00–18:00
March
Mar 1 17:00–19:00, 21:00–23:00 Mar 2 04:00–05:00, 17:00–18:00 Mar 6 15:00–17:00 Mar 7 00:00–01:00, 16:00–17:00 Mar 8 02:00–04:00, 16:00–17:00, 23:00–24:00 Mar 9 00:00–01:00, 15:00–17:00 Mar 11 04:00–06:00, 15:00–16:00 Mar 12 03:00–05:00, 15:00–17:00 Mar 13 01:00–02:00, 04:00–06:00, 16:00–17:00, 20:00–21:00 Mar 14 03:00–06:00, 20:00–22:00 Mar 15 03:00–05:00, 16:00–17:00, 21:00–22:00 Mar 16 03:00–04:00 Mar 19 01:00–02:00, 15:00–16:00, 22:00–24:00 Mar 20 04:00–05:00 Mar 21 04:00–06:00, 16:00–18:00, 20:00–21:00 Mar 22 05:00–07:00, 17:00–19:00 Mar 24 00:00–06:00, 17:00–18:00 Mar 25 03:00–06:00, 17:00–18:00, 22:00–23:00 Mar 27 22:00–24:00 Mar 28 00:00–02:00, 04:00–06:00, 17:00–18:00, 23:00–24:00 Mar 29 04:00–06:00, 16:00–18:00 Mar 31 01:00–02:00, 16:00–17:00, 22:00–23:00
April
Apr 1 17:00–18:00, 21:00–22:00 Apr 2 00:00–05:00, 21:00–23:00 Apr 3 03:00–06:00 Apr 4 03:00–06:00, 15:00–16:00 Apr 6 00:00–02:00 Apr 8 03:00–05:00, 21:00–22:00 Apr 9 00:00–01:00, 23:00–24:00 Apr 10 00:00–01:00, 04:00–06:00 Apr 11 16:00–17:00, 20:00–22:00 Apr 12 04:00–06:00 Apr 13 23:00–24:00 Apr 14 04:00–06:00 Apr 15 16:00–17:00, 23:00–24:00 Apr 17 04:00–06:00, 19:00–20:00 Apr 18 03:00–07:00, 16:00–17:00 Apr 20 03:00–07:00, 23:00–24:00 Apr 21 04:00–06:00, 22:00–23:00 Apr 22 16:00–17:00 Apr 23 04:00–05:00, 17:00–18:00, 23:00–24:00 Apr 24 04:00–06:00, 16:00–18:00 Apr 25 00:00–01:00, 03:00–06:00, 17:00–18:00 Apr 26 04:00–05:00 Apr 27 03:00–05:00 Apr 28 00:00–01:00, 03:00–05:00 Apr 30 14:00–15:00
May
May 1 05:00–06:00, 18:00–19:00, 21:00–22:00 May 2 03:00–07:00, 16:00–17:00, 22:00–24:00 May 3 00:00–01:00, 04:00–07:00 May 4 00:00–01:00, 22:00–24:00 May 5 03:00–05:00, 23:00–24:00 May 6 05:00–06:00, 15:00–17:00 May 7 03:00–04:00 May 8 17:00–19:00 May 9 16:00–17:00 May 10 04:00–06:00 May 12 03:00–06:00, 23:00–24:00 May 13 03:00–06:00 May 15 03:00–06:00 May 17 02:00–03:00 May 19 23:00–24:00 May 20 00:00–05:00 May 21 20:00–22:00 May 22 01:00–04:00, 13:00–18:00 May 23 14:00–15:00 May 24 21:00–24:00 May 26 02:00–03:00 May 27 03:00–05:00, 14:00–16:00 May 28 01:00–02:00 May 30 15:00–16:00, 21:00–23:00
June
Jun 1 13:00–16:00, 21:00–23:00 Jun 3 04:00–05:00, 22:00–24:00 Jun 4 00:00–01:00, 13:00–16:00, 22:00–24:00 Jun 5 00:00–01:00, 22:00–24:00 Jun 6 00:00–02:00, 14:00–16:00, 20:00–21:00, 23:00–24:00 Jun 7 00:00–01:00, 14:00–16:00 Jun 10 21:00–23:00 Jun 11 14:00–17:00 Jun 12 00:00–01:00, 14:00–17:00 Jun 13 00:00–01:00, 14:00–15:00 Jun 15 22:00–24:00 Jun 16 14:00–17:00 Jun 17 14:00–17:00 Jun 18 15:00–24:00 Jun 19 00:00–03:00 Jun 20 16:00–17:00, 22:00–24:00 Jun 21 15:00–17:00 Jun 23 00:00–01:00, 15:00–16:00, 22:00–23:00 Jun 24 15:00–16:00 Jun 25 15:00–16:00, 22:00–24:00 Jun 26 14:00–15:00 Jun 27 01:00–02:00, 14:00–15:00 Jun 29 00:00–01:00
July
Jul 2 15:00–16:00, 22:00–23:00 Jul 3 15:00–16:00, 23:00–24:00 Jul 5 16:00–18:00, 22:00–24:00 Jul 6 03:00–04:00, 21:00–24:00 Jul 7 23:00–24:00 Jul 8 15:00–16:00, 21:00–23:00 Jul 9 15:00–17:00, 23:00–24:00 Jul 11 00:00–01:00, 16:00–17:00 Jul 12 14:00–16:00 Jul 13 15:00–16:00, 23:00–24:00 Jul 14 23:00–24:00 Jul 15 00:00–01:00, 16:00–18:00, 22:00–24:00 Jul 16 00:00–01:00, 03:00–04:00, 15:00–18:00 Jul 19 23:00–24:00 Jul 20 00:00–01:00, 04:00–05:00, 23:00–24:00 Jul 21 00:00–03:00, 15:00–16:00, 23:00–24:00 Jul 22 02:00–04:00, 15:00–17:00, 22:00–23:00 Jul 23 00:00–01:00