Most often in June, 29 days.
Highest follower count seen that year: 2,333.
January
Jan 2 21:00–22:00 Jan 3 02:00–04:00, 17:00–19:00, 23:00–24:00 Jan 5 19:00–20:00 Jan 6 21:00–22:00 Jan 8 08:00–09:00, 19:00–21:00 Jan 10 03:00–04:00, 21:00–23:00 Jan 11 00:00–02:00, 09:00–10:00 Jan 12 17:00–19:00, 22:00–24:00 Jan 13 00:00–01:00, 06:00–07:00, 19:00–20:00, 23:00–24:00 Jan 14 18:00–20:00 Jan 15 03:00–04:00, 18:00–19:00 Jan 16 00:00–02:00, 04:00–06:00, 19:00–23:00 Jan 17 00:00–02:00, 22:00–24:00 Jan 18 04:00–05:00, 17:00–18:00, 22:00–23:00 Jan 19 06:00–08:00, 18:00–24:00 Jan 20 00:00–01:00, 03:00–04:00, 07:00–09:00, 17:00–19:00, 21:00–24:00 Jan 22 18:00–19:00 Jan 23 19:00–20:00 Jan 24 07:00–08:00 Jan 25 22:00–24:00 Jan 27 00:00–02:00, 04:00–06:00, 09:00–10:00, 21:00–23:00 Jan 30 22:00–23:00 Jan 31 00:00–02:00, 18:00–19:00
February
Feb 1 00:00–01:00, 06:00–08:00, 17:00–23:00 Feb 2 05:00–06:00 Feb 4 18:00–19:00 Feb 5 23:00–24:00 Feb 6 19:00–20:00 Feb 7 18:00–20:00 Feb 8 19:00–20:00 Feb 9 02:00–03:00, 18:00–20:00 Feb 12 22:00–24:00 Feb 15 19:00–20:00 Feb 16 00:00–01:00 Feb 18 19:00–20:00 Feb 20 22:00–23:00 Feb 25 01:00–02:00, 07:00–08:00, 23:00–24:00 Feb 26 00:00–01:00, 03:00–04:00, 08:00–10:00 Feb 27 09:00–10:00 Feb 28 19:00–22:00
March
Mar 1 01:00–02:00, 07:00–09:00, 22:00–24:00 Mar 2 08:00–10:00, 19:00–20:00 Mar 3 01:00–02:00, 04:00–05:00, 09:00–10:00 Mar 4 09:00–10:00 Mar 5 19:00–20:00 Mar 6 08:00–09:00 Mar 7 19:00–24:00 Mar 8 12:00–13:00 Mar 11 17:00–18:00, 22:00–24:00 Mar 13 22:00–24:00 Mar 14 05:00–07:00, 22:00–23:00 Mar 15 23:00–24:00 Mar 16 00:00–01:00, 21:00–23:00 Mar 17 21:00–22:00 Mar 18 08:00–09:00 Mar 19 07:00–09:00 Mar 20 08:00–09:00 Mar 22 08:00–09:00 Mar 23 00:00–01:00, 07:00–09:00, 22:00–23:00 Mar 24 21:00–23:00 Mar 25 04:00–06:00 Mar 26 22:00–23:00 Mar 27 07:00–09:00 Mar 28 22:00–24:00 Mar 30 21:00–23:00
April
Apr 1 23:00–24:00 Apr 3 07:00–09:00 Apr 4 21:00–24:00 Apr 6 20:00–22:00 Apr 8 03:00–04:00, 08:00–10:00 Apr 9 23:00–24:00 Apr 10 07:00–08:00 Apr 12 02:00–03:00 Apr 14 13:00–14:00, 22:00–23:00 Apr 15 00:00–01:00, 07:00–08:00 Apr 16 07:00–08:00 Apr 18 04:00–06:00 Apr 19 07:00–08:00 Apr 20 06:00–07:00 Apr 21 03:00–04:00 Apr 22 21:00–22:00 Apr 23 00:00–01:00 Apr 25 01:00–03:00, 07:00–08:00 Apr 27 01:00–03:00, 23:00–24:00 Apr 28 00:00–02:00 Apr 29 21:00–23:00 Apr 30 04:00–05:00
May
May 1 22:00–24:00 May 3 05:00–07:00 May 4 05:00–06:00, 23:00–24:00 May 5 04:00–06:00 May 6 22:00–24:00 May 7 16:00–18:00 May 8 07:00–08:00 May 9 21:00–23:00 May 10 02:00–04:00, 07:00–08:00 May 11 22:00–23:00 May 12 17:00–18:00 May 14 06:00–08:00 May 17 06:00–07:00 May 18 06:00–08:00 May 19 01:00–03:00 May 20 04:00–06:00 May 21 03:00–04:00 May 22 02:00–03:00, 07:00–08:00 May 24 00:00–01:00, 05:00–06:00 May 25 03:00–04:00 May 26 01:00–02:00, 06:00–08:00 May 27 04:00–05:00, 13:00–15:00 May 29 05:00–07:00 May 30 02:00–03:00, 06:00–07:00, 22:00–23:00 May 31 02:00–03:00, 06:00–07:00, 21:00–23:00
June
Jun 1 02:00–04:00, 07:00–08:00 Jun 2 08:00–09:00, 13:00–14:00, 18:00–19:00, 21:00–24:00 Jun 3 05:00–06:00, 17:00–18:00, 22:00–23:00 Jun 4 01:00–02:00, 07:00–08:00 Jun 5 12:00–13:00, 15:00–16:00 Jun 6 22:00–24:00 Jun 7 04:00–06:00, 11:00–14:00, 17:00–18:00, 22:00–24:00 Jun 8 04:00–05:00, 13:00–15:00, 17:00–19:00, 21:00–23:00 Jun 9 03:00–04:00, 07:00–09:00, 16:00–17:00, 22:00–23:00 Jun 10 01:00–03:00, 12:00–14:00, 17:00–19:00, 22:00–24:00 Jun 11 02:00–04:00, 18:00–19:00, 21:00–24:00 Jun 12 03:00–05:00, 23:00–24:00 Jun 13 00:00–01:00, 12:00–15:00 Jun 15 11:00–12:00, 15:00–17:00, 22:00–23:00 Jun 16 04:00–05:00 Jun 17 06:00–08:00, 16:00–17:00, 21:00–23:00 Jun 18 04:00–06:00, 21:00–23:00 Jun 19 01:00–03:00, 06:00–07:00 Jun 20 08:00–10:00 Jun 21 06:00–08:00, 21:00–22:00 Jun 22 01:00–03:00 Jun 23 00:00–01:00, 14:00–17:00, 21:00–24:00 Jun 24 02:00–04:00, 06:00–08:00, 21:00–22:00 Jun 25 01:00–02:00, 05:00–06:00, 12:00–14:00, 23:00–24:00 Jun 26 13:00–14:00, 21:00–22:00 Jun 27 05:00–07:00, 15:00–17:00, 23:00–24:00 Jun 28 04:00–05:00, 15:00–19:00, 22:00–23:00 Jun 29 00:00–01:00 Jun 30 16:00–17:00, 21:00–24:00
July
Jul 1 00:00–01:00, 03:00–04:00 Jul 2 14:00–16:00, 22:00–23:00 Jul 3 06:00–08:00, 23:00–24:00 Jul 4 00:00–01:00, 04:00–06:00 Jul 5 01:00–02:00, 06:00–07:00, 15:00–16:00, 22:00–24:00 Jul 6 02:00–04:00, 07:00–08:00 Jul 7 16:00–18:00 Jul 8 21:00–22:00 Jul 9 00:00–02:00, 22:00–24:00 Jul 10 03:00–04:00, 07:00–09:00, 13:00–16:00, 22:00–23:00 Jul 11 03:00–04:00, 22:00–24:00 Jul 12 06:00–07:00, 22:00–24:00 Jul 13 00:00–01:00, 14:00–15:00, 22:00–23:00 Jul 14 00:00–01:00, 04:00–06:00, 17:00–18:00 Jul 16 01:00–03:00, 22:00–24:00 Jul 17 06:00–08:00 Jul 18 05:00–06:00, 22:00–23:00 Jul 19 01:00–03:00, 07:00–08:00, 21:00–24:00 Jul 20 00:00–01:00, 07:00–09:00 Jul 21 01:00–02:00 Jul 22 01:00–02:00, 05:00–06:00 Jul 23 00:00–01:00, 07:00–09:00 Jul 24 06:00–07:00