Most often in March, 26 days.
Highest follower count seen that year: 3,443.
January
Jan 3 19:00–24:00 Jan 4 00:00–01:00, 20:00–21:00, 23:00–24:00 Jan 5 00:00–02:00, 20:00–24:00 Jan 6 00:00–01:00, 21:00–24:00 Jan 7 00:00–06:00 Jan 8 18:00–24:00 Jan 9 00:00–04:00 Jan 10 21:00–24:00 Jan 11 01:00–05:00, 20:00–24:00 Jan 12 01:00–04:00, 20:00–23:00 Jan 13 00:00–03:00, 22:00–24:00 Jan 14 00:00–04:00 Jan 16 20:00–22:00 Jan 17 02:00–04:00, 22:00–24:00 Jan 18 00:00–03:00, 20:00–22:00 Jan 19 18:00–24:00 Jan 20 00:00–01:00, 19:00–24:00 Jan 23 21:00–24:00 Jan 24 01:00–03:00, 21:00–24:00 Jan 25 00:00–03:00, 22:00–24:00 Jan 26 00:00–02:00 Jan 27 00:00–04:00 Jan 29 18:00–24:00 Jan 30 00:00–02:00, 19:00–24:00 Jan 31 00:00–01:00, 19:00–22:00
February
Feb 1 00:00–01:00, 03:00–04:00, 19:00–24:00 Feb 2 00:00–02:00, 21:00–23:00 Feb 3 00:00–04:00 Feb 5 19:00–24:00 Feb 6 00:00–01:00 Feb 7 17:00–24:00 Feb 8 17:00–24:00 Feb 9 00:00–01:00, 18:00–24:00 Feb 10 00:00–01:00, 19:00–24:00 Feb 11 00:00–03:00 Feb 12 22:00–24:00 Feb 13 00:00–04:00, 19:00–20:00 Feb 14 19:00–24:00 Feb 15 00:00–02:00, 18:00–21:00 Feb 16 21:00–24:00 Feb 17 00:00–01:00 Feb 20 10:00–14:00 Feb 22 07:00–16:00 Feb 24 09:00–15:00 Feb 26 10:00–15:00 Feb 27 09:00–15:00 Feb 28 09:00–14:00, 16:00–17:00
March
Mar 1 10:00–16:00 Mar 2 10:00–12:00, 15:00–16:00 Mar 5 18:00–23:00 Mar 6 00:00–01:00, 18:00–24:00 Mar 7 00:00–01:00, 19:00–24:00 Mar 8 00:00–01:00 Mar 9 19:00–20:00, 22:00–24:00 Mar 10 00:00–02:00 Mar 12 19:00–24:00 Mar 13 00:00–02:00, 22:00–24:00 Mar 14 00:00–02:00 Mar 15 18:00–20:00, 22:00–23:00 Mar 16 19:00–24:00 Mar 17 00:00–01:00 Mar 19 18:00–23:00 Mar 20 00:00–01:00, 18:00–21:00, 23:00–24:00 Mar 21 00:00–01:00 Mar 22 19:00–24:00 Mar 23 00:00–01:00, 21:00–24:00 Mar 24 00:00–02:00, 21:00–24:00 Mar 25 00:00–02:00 Mar 26 21:00–24:00 Mar 27 00:00–04:00, 22:00–24:00 Mar 28 00:00–03:00 Mar 30 21:00–24:00 Mar 31 21:00–24:00
April
Apr 1 00:00–01:00 Apr 2 19:00–20:00, 22:00–24:00 Apr 3 00:00–01:00 Apr 4 20:00–24:00 Apr 5 00:00–02:00 Apr 7 20:00–24:00 Apr 8 00:00–02:00 Apr 10 00:00–01:00, 20:00–22:00 Apr 15 20:00–24:00 Apr 17 22:00–24:00 Apr 18 00:00–03:00, 19:00–24:00 Apr 19 00:00–01:00, 20:00–24:00 Apr 20 00:00–01:00 Apr 21 19:00–24:00 Apr 24 23:00–24:00 Apr 25 00:00–02:00, 20:00–24:00 Apr 26 00:00–01:00, 21:00–23:00 Apr 27 17:00–24:00 Apr 28 00:00–01:00, 18:00–24:00 Apr 29 00:00–01:00 Apr 30 20:00–23:00
May
May 2 19:00–24:00 May 3 00:00–01:00 May 4 21:00–24:00 May 5 00:00–01:00, 20:00–24:00 May 8 19:00–23:00 May 9 00:00–01:00 May 10 18:00–24:00 May 11 19:00–24:00 May 12 20:00–24:00 May 13 00:00–01:00 May 14 20:00–24:00 May 15 00:00–01:00, 20:00–23:00 May 16 21:00–24:00 May 17 20:00–24:00 May 18 00:00–01:00, 18:00–24:00 May 19 19:00–24:00 May 22 18:00–24:00 May 23 00:00–01:00, 18:00–19:00, 21:00–24:00 May 24 18:00–24:00 May 28 19:00–23:00 May 29 19:00–21:00, 23:00–24:00 May 30 00:00–01:00, 21:00–24:00
June
Jun 1 17:00–24:00 Jun 2 00:00–01:00, 17:00–24:00 Jun 5 20:00–23:00 Jun 6 00:00–01:00, 21:00–24:00 Jun 7 00:00–02:00, 21:00–24:00 Jun 8 01:00–03:00, 19:00–24:00 Jun 9 17:00–20:00 Jun 12 20:00–24:00 Jun 13 00:00–02:00 Jun 15 19:00–24:00 Jun 19 21:00–24:00 Jun 20 20:00–24:00 Jun 21 21:00–22:00 Jun 23 22:00–24:00 Jun 25 19:00–24:00 Jun 26 16:00–19:00, 21:00–22:00 Jun 27 20:00–24:00 Jun 28 19:00–20:00, 22:00–24:00 Jun 29 20:00–24:00
July
Jul 2 19:00–24:00 Jul 3 18:00–24:00 Jul 4 20:00–24:00 Jul 5 00:00–01:00, 20:00–24:00 Jul 6 21:00–24:00 Jul 7 00:00–01:00 Jul 9 21:00–23:00 Jul 10 00:00–01:00, 21:00–24:00 Jul 11 00:00–01:00, 21:00–23:00 Jul 12 18:00–19:00, 21:00–24:00 Jul 14 00:00–01:00, 18:00–19:00, 22:00–24:00 Jul 16 21:00–24:00 Jul 17 23:00–24:00 Jul 23 22:00–23:00 Jul 24 01:00–03:00, 21:00–22:00 Jul 25 22:00–23:00 Jul 26 19:00–20:00, 21:00–24:00 Jul 27 20:00–21:00