Most often in July, 25 days.
Highest follower count seen that year: 9,726.
January
Jan 5 16:00–18:00 Jan 7 17:00–18:00 Jan 8 21:00–23:00 Jan 9 21:00–22:00 Jan 11 22:00–24:00 Jan 12 20:00–22:00 Jan 13 15:00–17:00 Jan 14 13:00–16:00, 19:00–20:00 Jan 16 18:00–20:00, 23:00–24:00 Jan 17 16:00–17:00, 21:00–24:00 Jan 18 17:00–18:00 Jan 19 19:00–21:00 Jan 20 00:00–01:00, 07:00–08:00, 20:00–22:00 Jan 21 16:00–19:00 Jan 22 11:00–14:00, 19:00–22:00 Jan 23 19:00–20:00 Jan 24 15:00–16:00, 21:00–23:00 Jan 25 22:00–24:00 Jan 26 01:00–02:00, 15:00–16:00, 18:00–20:00 Jan 27 21:00–24:00 Jan 28 04:00–06:00 Jan 29 02:00–03:00, 14:00–17:00, 19:00–20:00 Jan 30 14:00–18:00, 22:00–24:00 Jan 31 19:00–20:00
February
Feb 1 00:00–01:00, 05:00–08:00, 21:00–23:00 Feb 2 14:00–20:00 Feb 3 16:00–22:00 Feb 4 17:00–22:00 Feb 5 19:00–20:00, 22:00–24:00 Feb 6 00:00–01:00, 15:00–21:00 Feb 8 16:00–19:00 Feb 9 16:00–19:00, 22:00–24:00 Feb 11 18:00–20:00 Feb 12 02:00–03:00, 18:00–21:00 Feb 13 19:00–21:00 Feb 20 00:00–01:00 Feb 21 01:00–03:00 Feb 22 19:00–23:00 Feb 23 17:00–18:00, 23:00–24:00 Feb 24 22:00–24:00 Feb 25 20:00–22:00 Feb 26 15:00–17:00, 19:00–20:00 Feb 27 18:00–21:00
March
Mar 2 21:00–23:00 Mar 4 18:00–20:00 Mar 5 15:00–23:00 Mar 6 16:00–18:00 Mar 8 20:00–21:00 Mar 9 17:00–20:00 Mar 10 15:00–18:00 Mar 11 21:00–23:00 Mar 12 05:00–06:00 Mar 14 00:00–01:00 Mar 15 22:00–23:00 Mar 17 16:00–17:00, 19:00–21:00 Mar 18 21:00–23:00 Mar 19 17:00–22:00 Mar 21 03:00–04:00, 06:00–07:00, 19:00–21:00 Mar 22 22:00–24:00 Mar 23 20:00–24:00 Mar 24 15:00–16:00 Mar 25 18:00–22:00 Mar 26 20:00–24:00 Mar 27 22:00–24:00 Mar 28 00:00–04:00, 18:00–21:00 Mar 29 21:00–23:00 Mar 30 17:00–20:00, 22:00–24:00 Mar 31 02:00–04:00, 22:00–23:00
April
Apr 1 17:00–20:00 Apr 2 19:00–21:00 Apr 3 02:00–06:00 Apr 5 03:00–05:00, 22:00–23:00 Apr 7 18:00–20:00, 23:00–24:00 Apr 8 21:00–23:00 Apr 9 02:00–03:00, 08:00–10:00 Apr 10 04:00–06:00 Apr 11 04:00–06:00 Apr 15 10:00–11:00, 18:00–19:00 Apr 16 03:00–05:00, 23:00–24:00 Apr 17 00:00–01:00, 19:00–22:00 Apr 18 19:00–24:00 Apr 19 23:00–24:00 Apr 20 02:00–06:00, 21:00–23:00 Apr 21 01:00–08:00, 22:00–24:00 Apr 22 01:00–03:00, 21:00–23:00 Apr 23 19:00–22:00 Apr 24 21:00–23:00 Apr 25 00:00–06:00, 17:00–19:00 Apr 26 02:00–07:00 Apr 27 19:00–24:00 Apr 28 01:00–02:00, 23:00–24:00 Apr 29 00:00–01:00 Apr 30 21:00–22:00
May
May 1 02:00–04:00, 07:00–09:00 May 3 00:00–01:00 May 4 16:00–18:00 May 5 00:00–01:00, 03:00–05:00 May 6 10:00–12:00 May 7 19:00–20:00 May 11 08:00–09:00, 19:00–20:00 May 13 11:00–14:00 May 14 19:00–20:00, 23:00–24:00 May 15 19:00–21:00 May 18 19:00–21:00 May 19 21:00–23:00 May 23 17:00–18:00 May 24 18:00–20:00, 23:00–24:00 May 25 21:00–22:00 May 26 19:00–20:00 May 27 21:00–23:00 May 28 18:00–20:00 May 31 04:00–05:00
June
Jun 1 18:00–20:00 Jun 2 19:00–22:00 Jun 3 19:00–20:00 Jun 4 23:00–24:00 Jun 5 00:00–02:00, 22:00–24:00 Jun 7 10:00–12:00 Jun 8 20:00–22:00 Jun 9 02:00–04:00, 17:00–19:00, 23:00–24:00 Jun 10 00:00–01:00, 23:00–24:00 Jun 11 22:00–23:00 Jun 12 01:00–02:00, 19:00–20:00, 23:00–24:00 Jun 15 01:00–02:00, 18:00–20:00 Jun 16 18:00–20:00 Jun 17 04:00–05:00, 18:00–22:00 Jun 18 21:00–24:00 Jun 19 19:00–21:00 Jun 20 08:00–11:00, 23:00–24:00 Jun 21 00:00–01:00 Jun 22 05:00–07:00, 17:00–21:00 Jun 25 05:00–06:00 Jun 28 22:00–24:00 Jun 29 00:00–01:00, 21:00–24:00 Jun 30 00:00–03:00, 20:00–21:00
July
Jul 1 01:00–02:00 Jul 2 02:00–06:00, 21:00–23:00 Jul 3 19:00–22:00 Jul 4 00:00–03:00 Jul 5 03:00–04:00, 19:00–20:00 Jul 6 00:00–01:00, 18:00–21:00 Jul 7 18:00–21:00 Jul 8 02:00–05:00, 20:00–24:00 Jul 9 00:00–01:00, 06:00–08:00, 23:00–24:00 Jul 10 19:00–24:00 Jul 12 01:00–03:00, 21:00–23:00 Jul 13 03:00–08:00, 21:00–23:00 Jul 14 03:00–06:00, 22:00–24:00 Jul 15 00:00–01:00, 05:00–06:00 Jul 16 00:00–01:00, 04:00–06:00, 18:00–24:00 Jul 17 02:00–03:00, 06:00–09:00 Jul 18 01:00–03:00, 20:00–22:00 Jul 19 00:00–01:00, 05:00–07:00, 23:00–24:00 Jul 20 00:00–02:00, 05:00–07:00, 23:00–24:00 Jul 21 23:00–24:00 Jul 22 04:00–05:00, 21:00–22:00 Jul 23 00:00–03:00 Jul 24 01:00–02:00, 04:00–05:00, 21:00–24:00 Jul 25 00:00–05:00, 12:00–14:00, 22:00–24:00 Jul 27 04:00–05:00