Most often in July, 31 days.
Highest follower count seen that year: 11,208.
January
Jan 1 00:00–01:00, 21:00–23:00 Jan 2 22:00–24:00 Jan 3 21:00–23:00 Jan 4 22:00–24:00 Jan 5 00:00–02:00, 22:00–24:00 Jan 6 00:00–01:00, 22:00–24:00 Jan 7 00:00–01:00, 21:00–23:00 Jan 9 18:00–22:00 Jan 11 18:00–24:00 Jan 12 00:00–01:00, 22:00–24:00 Jan 13 00:00–04:00 Jan 14 16:00–21:00 Jan 15 18:00–21:00 Jan 16 17:00–18:00 Jan 17 20:00–24:00 Jan 18 00:00–08:00, 10:00–14:00, 20:00–24:00 Jan 19 00:00–09:00, 14:00–24:00 Jan 20 00:00–05:00 Jan 21 17:00–18:00 Jan 22 16:00–19:00 Jan 23 21:00–22:00 Jan 24 02:00–10:00, 15:00–19:00, 22:00–24:00 Jan 25 00:00–09:00, 14:00–20:00, 23:00–24:00 Jan 26 00:00–12:00, 17:00–20:00, 22:00–24:00 Jan 27 00:00–04:00, 17:00–19:00 Jan 28 17:00–20:00 Jan 29 17:00–20:00 Jan 30 16:00–19:00 Jan 31 18:00–24:00
February
Feb 1 00:00–08:00, 18:00–20:00, 22:00–24:00 Feb 2 00:00–08:00, 14:00–19:00, 21:00–24:00 Feb 3 00:00–05:00, 17:00–20:00 Feb 4 15:00–19:00 Feb 5 17:00–20:00 Feb 6 17:00–20:00 Feb 7 17:00–19:00, 23:00–24:00 Feb 8 00:00–01:00, 07:00–10:00, 15:00–24:00 Feb 9 00:00–05:00, 14:00–16:00, 18:00–24:00 Feb 10 00:00–05:00, 18:00–20:00 Feb 11 17:00–19:00 Feb 12 17:00–22:00 Feb 13 16:00–19:00 Feb 14 21:00–24:00 Feb 15 00:00–14:00, 21:00–24:00 Feb 16 00:00–13:00, 21:00–24:00 Feb 17 00:00–05:00, 18:00–22:00 Feb 18 18:00–22:00 Feb 19 18:00–22:00 Feb 20 21:00–24:00 Feb 21 21:00–24:00 Feb 22 00:00–06:00, 16:00–24:00 Feb 23 00:00–09:00, 21:00–24:00 Feb 24 00:00–05:00, 16:00–18:00 Feb 25 17:00–21:00 Feb 26 18:00–20:00 Feb 27 16:00–19:00 Feb 28 21:00–24:00
March
Mar 1 00:00–12:00, 21:00–24:00 Mar 2 00:00–08:00, 21:00–24:00 Mar 3 00:00–05:00, 16:00–18:00 Mar 4 17:00–21:00 Mar 6 15:00–18:00 Mar 7 21:00–24:00 Mar 8 00:00–10:00, 21:00–24:00 Mar 9 00:00–10:00, 22:00–24:00 Mar 10 00:00–05:00, 16:00–19:00 Mar 11 17:00–20:00 Mar 12 17:00–20:00 Mar 13 16:00–18:00 Mar 14 21:00–24:00 Mar 15 00:00–11:00, 21:00–24:00 Mar 16 00:00–13:00, 21:00–24:00 Mar 17 00:00–05:00, 16:00–19:00 Mar 18 16:00–20:00 Mar 19 16:00–21:00 Mar 20 17:00–19:00 Mar 21 21:00–24:00 Mar 22 00:00–07:00, 22:00–24:00 Mar 23 00:00–19:00, 21:00–24:00 Mar 24 00:00–04:00, 16:00–19:00 Mar 25 16:00–19:00 Mar 26 17:00–19:00 Mar 27 17:00–20:00 Mar 28 20:00–24:00 Mar 29 00:00–14:00, 22:00–24:00 Mar 30 00:00–11:00, 21:00–24:00 Mar 31 00:00–03:00, 15:00–19:00
April
Apr 1 15:00–18:00 Apr 2 15:00–18:00 Apr 3 15:00–18:00 Apr 4 20:00–24:00 Apr 5 00:00–09:00 Apr 6 04:00–07:00, 11:00–14:00 Apr 7 15:00–18:00 Apr 8 15:00–18:00 Apr 10 15:00–18:00 Apr 11 21:00–24:00 Apr 12 00:00–07:00, 20:00–24:00 Apr 13 00:00–07:00, 19:00–24:00 Apr 14 00:00–04:00, 16:00–19:00 Apr 15 15:00–19:00 Apr 16 16:00–19:00 Apr 17 21:00–24:00 Apr 18 03:00–08:00, 20:00–24:00 Apr 19 00:00–04:00 Apr 20 08:00–12:00 Apr 21 06:00–08:00, 10:00–14:00, 22:00–24:00 Apr 22 00:00–12:00, 21:00–24:00 Apr 23 00:00–04:00, 16:00–19:00 Apr 24 16:00–24:00 Apr 25 00:00–01:00, 23:00–24:00 Apr 26 00:00–14:00, 20:00–24:00 Apr 27 00:00–14:00, 23:00–24:00 Apr 28 00:00–01:00, 21:00–24:00 Apr 29 17:00–20:00 Apr 30 23:00–24:00
May
May 1 00:00–11:00, 20:00–24:00 May 2 00:00–03:00 May 3 03:00–08:00, 20:00–23:00 May 4 04:00–10:00, 22:00–23:00 May 5 16:00–18:00 May 6 19:00–23:00 May 7 21:00–22:00 May 8 15:00–21:00 May 9 23:00–24:00 May 10 00:00–07:00, 20:00–24:00 May 11 00:00–07:00, 14:00–23:00 May 12 00:00–03:00, 15:00–18:00 May 13 15:00–19:00 May 14 15:00–18:00 May 15 15:00–17:00 May 16 21:00–24:00 May 17 00:00–10:00, 21:00–24:00 May 18 00:00–08:00, 21:00–24:00 May 19 00:00–04:00, 18:00–21:00 May 20 15:00–18:00 May 21 15:00–18:00 May 22 14:00–16:00 May 23 23:00–24:00 May 24 00:00–07:00, 18:00–24:00 May 25 00:00–06:00, 19:00–24:00 May 26 00:00–03:00, 15:00–18:00 May 27 15:00–18:00 May 28 15:00–18:00 May 29 15:00–18:00 May 31 00:00–08:00, 21:00–24:00
June
Jun 1 00:00–09:00, 20:00–24:00 Jun 2 00:00–04:00, 15:00–19:00 Jun 3 15:00–21:00 Jun 4 15:00–19:00 Jun 5 15:00–18:00 Jun 7 21:00–24:00 Jun 8 00:00–09:00, 20:00–21:00 Jun 9 00:00–08:00, 14:00–19:00, 22:00–24:00 Jun 10 00:00–04:00, 15:00–18:00 Jun 11 16:00–19:00 Jun 12 17:00–22:00 Jun 14 01:00–07:00, 23:00–24:00 Jun 15 00:00–02:00, 21:00–24:00 Jun 16 00:00–04:00, 15:00–18:00 Jun 17 19:00–22:00 Jun 18 19:00–21:00 Jun 19 15:00–18:00 Jun 20 22:00–24:00 Jun 21 00:00–07:00, 22:00–24:00 Jun 22 00:00–07:00, 21:00–24:00 Jun 23 00:00–03:00, 15:00–18:00 Jun 24 15:00–18:00 Jun 25 15:00–17:00 Jun 26 18:00–21:00 Jun 27 20:00–24:00 Jun 28 00:00–07:00, 22:00–24:00 Jun 29 00:00–07:00, 22:00–24:00 Jun 30 00:00–04:00, 15:00–18:00
July
Jul 1 18:00–22:00 Jul 2 14:00–17:00 Jul 3 15:00–18:00 Jul 4 22:00–24:00 Jul 5 00:00–07:00, 22:00–24:00 Jul 6 00:00–07:00, 21:00–24:00 Jul 7 00:00–04:00, 18:00–22:00 Jul 8 15:00–18:00 Jul 9 15:00–18:00 Jul 10 15:00–18:00 Jul 11 22:00–24:00 Jul 12 00:00–06:00, 22:00–24:00 Jul 13 00:00–07:00, 21:00–24:00 Jul 14 00:00–04:00, 15:00–18:00 Jul 15 15:00–18:00 Jul 16 15:00–18:00 Jul 17 15:00–18:00 Jul 18 22:00–24:00 Jul 19 00:00–06:00 Jul 20 21:00–24:00 Jul 21 00:00–04:00, 15:00–18:00 Jul 22 17:00–20:00 Jul 23 15:00–19:00 Jul 24 15:00–18:00 Jul 25 22:00–24:00 Jul 26 00:00–07:00, 22:00–24:00 Jul 27 00:00–07:00, 22:00–24:00 Jul 28 00:00–04:00, 15:00–18:00 Jul 29 18:00–20:00 Jul 30 15:00–19:00 Jul 31 15:00–18:00
August
Aug 1 22:00–24:00 Aug 2 00:00–07:00 Aug 3 22:00–24:00 Aug 4 00:00–04:00, 15:00–18:00 Aug 5 15:00–18:00 Aug 6 16:00–18:00 Aug 7 15:00–18:00 Aug 8 23:00–24:00 Aug 9 00:00–07:00, 22:00–24:00 Aug 10 00:00–07:00, 21:00–24:00 Aug 11 00:00–04:00, 18:00–19:00 Aug 12 17:00–21:00 Aug 13 16:00–18:00 Aug 16 11:00–24:00 Aug 17 00:00–04:00, 08:00–13:00, 20:00–24:00 Aug 18 00:00–04:00 Aug 22 20:00–23:00 Aug 30 22:00–24:00 Aug 31 00:00–07:00, 14:00–15:00, 21:00–24:00
September
Sep 1 00:00–04:00, 18:00–20:00 Sep 2 16:00–18:00 Sep 3 15:00–18:00 Sep 4 15:00–18:00 Sep 5 21:00–24:00 Sep 6 00:00–06:00, 23:00–24:00 Sep 7 00:00–09:00, 21:00–24:00 Sep 8 00:00–03:00, 18:00–21:00 Sep 9 18:00–20:00 Sep 10 16:00–18:00 Sep 11 15:00–18:00 Sep 12 22:00–24:00 Sep 13 00:00–07:00, 23:00–24:00 Sep 14 00:00–07:00 Sep 20 21:00–24:00 Sep 21 00:00–06:00, 14:00–18:00, 20:00–24:00 Sep 22 00:00–04:00, 17:00–20:00 Sep 23 15:00–17:00 Sep 24 15:00–17:00 Sep 25 15:00–18:00 Sep 26 21:00–24:00 Sep 27 00:00–07:00, 21:00–24:00 Sep 28 00:00–06:00, 08:00–10:00, 12:00–16:00, 21:00–24:00 Sep 29 00:00–04:00, 17:00–20:00 Sep 30 17:00–20:00
October
Oct 1 15:00–18:00 Oct 2 16:00–18:00 Oct 3 16:00–20:00, 22:00–24:00 Oct 4 00:00–07:00, 16:00–20:00 Oct 5 00:00–03:00, 11:00–15:00, 21:00–24:00 Oct 6 00:00–04:00, 15:00–17:00 Oct 7 15:00–17:00 Oct 8 15:00–18:00 Oct 9 15:00–17:00 Oct 10 22:00–24:00 Oct 11 00:00–07:00, 09:00–14:00, 21:00–24:00 Oct 12 00:00–07:00, 13:00–17:00, 20:00–24:00 Oct 13 00:00–04:00, 14:00–18:00 Oct 14 16:00–18:00 Oct 15 15:00–18:00 Oct 16 15:00–18:00 Oct 17 21:00–24:00 Oct 18 00:00–06:00, 21:00–24:00 Oct 19 00:00–08:00