Most often in January, 27 days.
Highest follower count seen that year: 3,018.
January
Jan 2 18:00–24:00 Jan 3 00:00–04:00, 23:00–24:00 Jan 4 01:00–04:00 Jan 6 23:00–24:00 Jan 7 01:00–02:00, 23:00–24:00 Jan 8 00:00–04:00, 23:00–24:00 Jan 9 00:00–04:00, 23:00–24:00 Jan 10 00:00–04:00, 23:00–24:00 Jan 11 00:00–04:00 Jan 12 23:00–24:00 Jan 13 00:00–04:00, 23:00–24:00 Jan 14 00:00–04:00, 23:00–24:00 Jan 15 00:00–04:00, 23:00–24:00 Jan 16 00:00–04:00, 23:00–24:00 Jan 17 00:00–04:00, 23:00–24:00 Jan 18 00:00–04:00 Jan 20 23:00–24:00 Jan 21 00:00–04:00, 23:00–24:00 Jan 22 00:00–04:00, 23:00–24:00 Jan 23 00:00–04:00 Jan 24 22:00–24:00 Jan 25 00:00–04:00 Jan 26 23:00–24:00 Jan 27 00:00–04:00, 23:00–24:00 Jan 28 00:00–04:00, 23:00–24:00 Jan 29 00:00–04:00, 23:00–24:00 Jan 30 00:00–03:00
February
Feb 1 00:00–04:00 Feb 2 23:00–24:00 Feb 3 00:00–04:00, 23:00–24:00 Feb 4 00:00–04:00, 23:00–24:00 Feb 5 00:00–04:00, 23:00–24:00 Feb 6 00:00–04:00 Feb 7 00:00–04:00, 23:00–24:00 Feb 8 00:00–04:00 Feb 10 23:00–24:00 Feb 11 00:00–03:00, 23:00–24:00 Feb 12 00:00–04:00 Feb 13 23:00–24:00 Feb 14 00:00–09:00, 23:00–24:00 Feb 15 00:00–09:00 Feb 17 23:00–24:00 Feb 18 00:00–05:00, 23:00–24:00 Feb 19 00:00–04:00 Feb 20 00:00–02:00, 23:00–24:00 Feb 21 00:00–04:00, 23:00–24:00 Feb 22 00:00–04:00
March
Mar 2 22:00–24:00 Mar 3 00:00–04:00, 23:00–24:00 Mar 4 00:00–04:00 Mar 5 00:00–04:00, 23:00–24:00 Mar 6 00:00–04:00, 23:00–24:00 Mar 7 00:00–04:00, 23:00–24:00 Mar 8 00:00–02:00 Mar 9 23:00–24:00 Mar 10 00:00–04:00, 23:00–24:00 Mar 11 00:00–04:00, 22:00–24:00 Mar 12 00:00–04:00, 23:00–24:00 Mar 13 00:00–04:00, 23:00–24:00 Mar 14 00:00–04:00, 23:00–24:00 Mar 15 00:00–04:00 Mar 18 00:00–04:00, 23:00–24:00 Mar 19 00:00–03:00, 23:00–24:00 Mar 20 00:00–04:00 Mar 21 22:00–24:00 Mar 22 00:00–04:00 Mar 24 22:00–24:00 Mar 25 00:00–04:00 Mar 26 23:00–24:00 Mar 27 00:00–03:00, 23:00–24:00 Mar 28 00:00–03:00, 23:00–24:00 Mar 29 00:00–02:00 Mar 30 23:00–24:00 Mar 31 00:00–03:00
April
Apr 1 23:00–24:00 Apr 2 00:00–04:00, 18:00–24:00 Apr 4 23:00–24:00 Apr 5 00:00–04:00 Apr 6 22:00–24:00 Apr 7 00:00–01:00, 03:00–04:00, 23:00–24:00 Apr 8 00:00–04:00, 22:00–23:00 Apr 9 00:00–04:00 Apr 10 00:00–04:00 Apr 11 03:00–04:00, 23:00–24:00 Apr 12 00:00–04:00 Apr 13 23:00–24:00 Apr 14 00:00–04:00, 23:00–24:00 Apr 15 00:00–04:00, 23:00–24:00 Apr 16 00:00–04:00 Apr 17 22:00–24:00 Apr 18 00:00–04:00, 23:00–24:00 Apr 19 00:00–04:00 Apr 21 23:00–24:00 Apr 22 00:00–04:00, 23:00–24:00 Apr 23 00:00–05:00 Apr 24 00:00–04:00 Apr 25 21:00–24:00 Apr 26 00:00–04:00 Apr 27 23:00–24:00 Apr 28 00:00–04:00 Apr 30 23:00–24:00
May
May 1 00:00–04:00 May 4 23:00–24:00 May 5 00:00–03:00, 23:00–24:00 May 6 00:00–04:00 May 7 00:00–04:00 May 9 00:00–01:00, 03:00–04:00 May 10 00:00–07:00 May 21 01:00–04:00 May 22 00:00–04:00, 23:00–24:00 May 23 00:00–04:00 May 25 23:00–24:00 May 26 00:00–04:00, 23:00–24:00 May 27 00:00–04:00 May 28 00:00–05:00, 23:00–24:00 May 29 00:00–04:00, 23:00–24:00 May 30 01:00–04:00 May 31 00:00–04:00
June
Jun 1 23:00–24:00 Jun 2 00:00–04:00, 23:00–24:00 Jun 3 00:00–04:00, 23:00–24:00 Jun 4 00:00–04:00 Jun 6 00:00–02:00 Jun 7 01:00–08:00 Jun 10 00:00–04:00, 23:00–24:00 Jun 11 00:00–04:00 Jun 12 00:00–04:00, 23:00–24:00 Jun 13 00:00–08:00 Jun 15 17:00–22:00 Jun 16 23:00–24:00 Jun 17 00:00–03:00, 23:00–24:00 Jun 18 00:00–01:00, 03:00–04:00 Jun 19 23:00–24:00 Jun 20 00:00–04:00, 23:00–24:00 Jun 21 00:00–04:00 Jun 24 01:00–04:00 Jun 25 00:00–03:00, 23:00–24:00 Jun 26 00:00–04:00 Jun 29 18:00–22:00
July
Jul 1 00:00–04:00, 23:00–24:00 Jul 2 00:00–04:00 Jul 3 18:00–23:00 Jul 5 00:00–04:00 Jul 6 23:00–24:00 Jul 7 00:00–04:00 Jul 8 23:00–24:00 Jul 9 00:00–04:00, 23:00–24:00 Jul 10 01:00–04:00 Jul 11 00:00–08:00, 23:00–24:00 Jul 12 00:00–04:00, 19:00–24:00 Jul 15 00:00–03:00 Jul 17 20:00–24:00 Jul 19 00:00–07:00 Jul 20 14:00–22:00 Jul 21 23:00–24:00 Jul 22 00:00–04:00 Jul 23 00:00–09:00 Jul 24 00:00–03:00, 05:00–07:00 Jul 25 02:00–03:00