Most often in May, 27 days.
Highest follower count seen that year: 4,855.
January
Jan 2 19:00–23:00 Jan 3 01:00–05:00, 17:00–22:00 Jan 4 00:00–01:00, 04:00–05:00, 17:00–23:00 Jan 5 01:00–05:00, 20:00–24:00 Jan 6 00:00–05:00 Jan 8 18:00–22:00 Jan 9 01:00–06:00, 20:00–24:00 Jan 10 02:00–03:00, 18:00–20:00, 22:00–24:00 Jan 11 17:00–24:00 Jan 12 00:00–04:00, 23:00–24:00 Jan 13 02:00–04:00 Jan 15 18:00–23:00 Jan 16 01:00–05:00, 20:00–21:00, 23:00–24:00 Jan 17 00:00–06:00, 18:00–24:00 Jan 18 02:00–04:00, 18:00–23:00 Jan 19 01:00–06:00, 22:00–24:00 Jan 20 02:00–04:00 Jan 22 18:00–24:00 Jan 23 01:00–06:00, 21:00–24:00 Jan 24 02:00–03:00, 18:00–24:00 Jan 25 03:00–04:00, 17:00–19:00, 22:00–23:00 Jan 26 02:00–05:00, 17:00–19:00, 21:00–23:00 Jan 27 00:00–01:00, 03:00–04:00 Jan 29 18:00–24:00 Jan 30 03:00–05:00, 18:00–24:00 Jan 31 01:00–04:00, 17:00–19:00, 21:00–24:00
February
Feb 1 17:00–23:00 Feb 2 01:00–05:00, 18:00–19:00 Feb 3 01:00–06:00 Feb 4 22:00–24:00 Feb 5 00:00–04:00 Feb 6 01:00–04:00, 19:00–20:00 Feb 7 03:00–06:00, 19:00–24:00 Feb 8 00:00–01:00, 04:00–05:00, 18:00–23:00 Feb 9 00:00–03:00, 17:00–18:00, 23:00–24:00 Feb 10 01:00–06:00, 23:00–24:00 Feb 11 00:00–05:00, 23:00–24:00 Feb 12 00:00–04:00, 22:00–23:00 Feb 13 02:00–06:00, 18:00–22:00 Feb 14 02:00–05:00, 17:00–19:00 Feb 15 00:00–01:00, 16:00–17:00, 20:00–24:00 Feb 16 02:00–05:00, 18:00–19:00, 22:00–24:00 Feb 17 00:00–06:00 Feb 19 00:00–01:00, 03:00–05:00, 16:00–17:00, 21:00–23:00 Feb 20 01:00–06:00 Feb 21 03:00–05:00, 18:00–20:00, 22:00–24:00 Feb 22 02:00–06:00, 17:00–19:00, 21:00–24:00 Feb 23 00:00–05:00, 17:00–19:00 Feb 24 02:00–04:00 Feb 26 00:00–06:00, 19:00–24:00 Feb 27 01:00–06:00, 18:00–20:00, 22:00–23:00 Feb 28 00:00–06:00, 17:00–24:00
March
Mar 1 00:00–01:00, 03:00–04:00, 18:00–19:00, 22:00–23:00 Mar 2 01:00–06:00, 17:00–19:00, 21:00–24:00 Mar 3 02:00–05:00 Mar 5 02:00–04:00, 21:00–22:00 Mar 6 02:00–04:00, 18:00–19:00 Mar 7 00:00–04:00, 06:00–07:00, 18:00–24:00 Mar 8 05:00–06:00, 18:00–19:00, 23:00–24:00 Mar 9 02:00–03:00, 19:00–20:00 Mar 10 00:00–01:00, 03:00–05:00 Mar 12 02:00–03:00, 05:00–06:00, 19:00–23:00 Mar 13 01:00–06:00, 17:00–19:00, 22:00–24:00 Mar 14 00:00–04:00, 18:00–19:00, 21:00–24:00 Mar 15 04:00–06:00, 17:00–19:00, 22:00–23:00 Mar 16 03:00–06:00, 18:00–24:00 Mar 17 02:00–05:00 Mar 19 17:00–19:00, 22:00–23:00 Mar 20 01:00–06:00, 21:00–24:00 Mar 21 02:00–06:00, 18:00–19:00, 22:00–24:00 Mar 22 03:00–05:00, 17:00–19:00, 22:00–23:00 Mar 23 01:00–07:00, 18:00–23:00 Mar 24 02:00–06:00 Mar 26 02:00–03:00, 05:00–06:00, 18:00–19:00, 22:00–24:00 Mar 27 03:00–07:00, 22:00–23:00 Mar 28 00:00–03:00, 18:00–24:00 Mar 29 00:00–01:00, 04:00–07:00, 17:00–18:00, 21:00–23:00 Mar 30 01:00–03:00, 17:00–19:00, 22:00–23:00 Mar 31 01:00–05:00
April
Apr 2 00:00–06:00, 17:00–18:00, 21:00–23:00 Apr 3 01:00–06:00, 16:00–17:00 Apr 4 01:00–05:00, 16:00–18:00, 20:00–24:00 Apr 5 00:00–01:00, 03:00–07:00, 16:00–23:00 Apr 6 00:00–02:00, 04:00–06:00, 17:00–24:00 Apr 7 03:00–05:00 Apr 9 02:00–06:00 Apr 10 00:00–06:00, 17:00–18:00, 21:00–22:00 Apr 11 04:00–07:00, 17:00–18:00, 21:00–23:00 Apr 12 02:00–03:00, 22:00–23:00 Apr 13 02:00–06:00, 16:00–18:00, 20:00–24:00 Apr 14 03:00–07:00 Apr 16 00:00–04:00, 16:00–18:00 Apr 17 00:00–06:00, 21:00–23:00 Apr 18 00:00–06:00, 16:00–18:00, 20:00–22:00 Apr 19 00:00–01:00, 05:00–06:00, 17:00–19:00, 22:00–23:00 Apr 20 01:00–06:00, 17:00–18:00, 21:00–23:00 Apr 21 03:00–04:00 Apr 23 00:00–01:00, 04:00–05:00, 18:00–20:00, 22:00–23:00 Apr 24 03:00–06:00, 18:00–23:00 Apr 25 02:00–04:00, 21:00–23:00 Apr 26 00:00–01:00, 03:00–06:00, 17:00–19:00, 21:00–22:00 Apr 27 01:00–06:00, 17:00–19:00, 21:00–23:00 Apr 28 00:00–02:00, 04:00–06:00 Apr 30 17:00–19:00, 21:00–24:00
May
May 1 01:00–03:00, 05:00–07:00, 17:00–18:00, 20:00–22:00 May 2 00:00–06:00 May 3 00:00–02:00, 04:00–07:00, 18:00–20:00, 22:00–24:00 May 4 05:00–06:00, 17:00–19:00, 21:00–23:00 May 5 01:00–06:00 May 7 00:00–05:00, 17:00–19:00 May 8 05:00–07:00, 19:00–20:00, 22:00–23:00 May 9 03:00–07:00, 17:00–24:00 May 10 00:00–01:00, 03:00–07:00, 19:00–23:00 May 11 03:00–06:00, 17:00–19:00, 21:00–23:00 May 12 02:00–06:00 May 14 00:00–01:00, 03:00–06:00, 22:00–23:00 May 15 03:00–05:00, 17:00–19:00, 21:00–22:00 May 16 01:00–02:00, 04:00–06:00, 17:00–18:00, 21:00–24:00 May 17 05:00–06:00, 20:00–22:00 May 18 00:00–02:00, 04:00–05:00, 21:00–23:00 May 19 00:00–05:00 May 21 01:00–07:00, 23:00–24:00 May 22 02:00–06:00, 18:00–19:00, 22:00–23:00 May 23 01:00–02:00, 04:00–07:00, 17:00–19:00 May 24 04:00–05:00, 17:00–19:00, 21:00–23:00 May 25 03:00–06:00, 17:00–19:00, 21:00–24:00 May 26 01:00–07:00 May 28 02:00–07:00, 18:00–23:00 May 29 00:00–06:00, 18:00–20:00, 22:00–24:00 May 30 02:00–06:00, 18:00–23:00 May 31 00:00–01:00, 03:00–06:00, 18:00–23:00
June
Jun 1 01:00–06:00, 18:00–19:00, 21:00–22:00 Jun 2 01:00–06:00 Jun 4 01:00–07:00, 18:00–19:00, 23:00–24:00 Jun 5 00:00–07:00, 19:00–23:00 Jun 6 00:00–01:00, 03:00–07:00, 18:00–23:00 Jun 7 00:00–01:00, 04:00–08:00, 19:00–24:00 Jun 8 02:00–06:00, 18:00–23:00 Jun 9 01:00–07:00 Jun 10 02:00–06:00, 23:00–24:00 Jun 11 00:00–05:00, 17:00–19:00, 21:00–23:00 Jun 12 01:00–06:00, 18:00–20:00, 22:00–23:00 Jun 13 00:00–06:00 Jun 15 02:00–06:00, 17:00–18:00, 21:00–23:00 Jun 16 01:00–05:00 Jun 18 04:00–05:00, 20:00–22:00 Jun 19 02:00–06:00, 18:00–19:00, 21:00–23:00 Jun 20 01:00–06:00, 17:00–18:00, 20:00–24:00 Jun 21 03:00–05:00, 17:00–18:00 Jun 22 01:00–06:00, 21:00–22:00 Jun 23 05:00–07:00 Jun 25 04:00–06:00, 22:00–23:00 Jun 26 00:00–07:00, 22:00–24:00 Jun 27 02:00–06:00, 22:00–24:00 Jun 28 03:00–06:00, 22:00–24:00 Jun 29 03:00–06:00, 23:00–24:00 Jun 30 00:00–01:00, 05:00–06:00
July
Jul 2 01:00–06:00, 21:00–23:00 Jul 3 02:00–06:00, 22:00–24:00 Jul 4 02:00–06:00, 17:00–24:00 Jul 5 00:00–01:00, 04:00–07:00, 21:00–22:00 Jul 6 00:00–01:00, 04:00–05:00, 21:00–24:00 Jul 7 00:00–01:00, 03:00–06:00 Jul 9 23:00–24:00 Jul 10 00:00–06:00, 22:00–23:00 Jul 11 02:00–06:00, 18:00–23:00 Jul 12 02:00–03:00, 05:00–06:00, 18:00–19:00, 21:00–22:00 Jul 13 01:00–05:00 Jul 16 23:00–24:00 Jul 17 00:00–01:00, 03:00–06:00 Jul 19 05:00–06:00, 22:00–23:00 Jul 20 01:00–05:00 Jul 21 00:00–01:00, 03:00–06:00 Jul 24 01:00–02:00, 04:00–06:00 Jul 25 18:00–19:00, 21:00–24:00 Jul 26 03:00–06:00, 17:00–19:00, 21:00–23:00 Jul 27 01:00–02:00, 05:00–06:00