Most often in August, 28 days.
Highest follower count seen that year: 753,618.
January
Jan 2 21:00–24:00 Jan 3 00:00–07:00, 22:00–24:00 Jan 4 00:00–06:00, 13:00–17:00, 22:00–24:00 Jan 5 00:00–02:00 Jan 6 21:00–24:00 Jan 7 00:00–07:00, 21:00–24:00 Jan 8 00:00–06:00, 22:00–24:00 Jan 9 00:00–04:00, 12:00–16:00, 21:00–24:00 Jan 10 00:00–06:00, 21:00–24:00 Jan 11 00:00–06:00 Jan 13 21:00–24:00 Jan 14 00:00–06:00, 21:00–24:00 Jan 15 00:00–03:00, 13:00–17:00, 21:00–24:00 Jan 16 00:00–06:00, 21:00–24:00 Jan 17 00:00–04:00, 21:00–24:00 Jan 18 00:00–06:00, 13:00–17:00 Jan 20 21:00–24:00 Jan 21 00:00–07:00, 21:00–24:00 Jan 22 00:00–04:00, 13:00–17:00, 21:00–24:00 Jan 23 00:00–06:00, 21:00–22:00 Jan 24 02:00–06:00, 21:00–24:00 Jan 25 00:00–06:00 Jan 27 21:00–24:00 Jan 28 00:00–06:00, 21:00–24:00 Jan 29 00:00–06:00, 22:00–24:00 Jan 30 00:00–07:00, 21:00–24:00 Jan 31 00:00–06:00, 21:00–24:00
February
Feb 1 00:00–06:00 Feb 3 21:00–24:00 Feb 4 00:00–04:00, 21:00–24:00 Feb 5 00:00–06:00, 21:00–24:00 Feb 6 00:00–06:00, 21:00–24:00 Feb 7 00:00–06:00, 22:00–24:00 Feb 8 00:00–07:00 Feb 10 21:00–24:00 Feb 11 00:00–05:00, 12:00–17:00, 21:00–24:00 Feb 12 00:00–06:00, 21:00–24:00 Feb 13 00:00–06:00, 21:00–24:00 Feb 14 00:00–06:00, 21:00–24:00 Feb 15 00:00–06:00 Feb 17 21:00–24:00 Feb 18 00:00–06:00, 21:00–24:00 Feb 19 00:00–06:00, 21:00–24:00 Feb 20 00:00–06:00, 21:00–24:00 Feb 21 00:00–06:00, 21:00–24:00 Feb 22 00:00–06:00 Feb 24 21:00–24:00 Feb 25 00:00–05:00, 21:00–24:00 Feb 26 00:00–06:00, 22:00–24:00 Feb 27 00:00–06:00, 22:00–24:00 Feb 28 00:00–05:00, 12:00–18:00, 22:00–24:00
March
Mar 1 00:00–02:00 Mar 2 16:00–23:00 Mar 3 21:00–24:00 Mar 4 00:00–06:00, 21:00–24:00 Mar 5 00:00–06:00, 14:00–18:00, 22:00–24:00 Mar 6 00:00–05:00, 21:00–24:00 Mar 7 00:00–06:00, 21:00–24:00 Mar 8 00:00–03:00 Mar 10 21:00–24:00 Mar 11 00:00–07:00, 21:00–24:00 Mar 12 00:00–05:00, 21:00–24:00 Mar 13 00:00–05:00, 22:00–24:00 Mar 14 00:00–06:00, 21:00–24:00 Mar 15 00:00–04:00 Mar 17 21:00–24:00 Mar 18 00:00–05:00, 21:00–24:00 Mar 19 00:00–06:00, 21:00–24:00 Mar 20 00:00–06:00, 21:00–24:00 Mar 21 00:00–05:00, 22:00–24:00 Mar 22 00:00–05:00 Mar 24 21:00–24:00 Mar 25 00:00–03:00, 11:00–17:00, 21:00–24:00 Mar 26 00:00–05:00, 21:00–24:00 Mar 27 00:00–06:00, 21:00–24:00 Mar 28 00:00–04:00, 21:00–24:00 Mar 29 00:00–06:00 Mar 31 20:00–24:00
April
Apr 1 00:00–05:00, 21:00–24:00 Apr 2 00:00–05:00, 21:00–24:00 Apr 3 00:00–05:00, 20:00–24:00 Apr 4 00:00–05:00, 21:00–24:00 Apr 5 00:00–05:00 Apr 7 20:00–24:00 Apr 8 00:00–05:00, 20:00–24:00 Apr 9 00:00–05:00, 21:00–24:00 Apr 10 00:00–02:00, 12:00–15:00, 20:00–24:00 Apr 11 00:00–04:00, 21:00–24:00 Apr 12 00:00–04:00 Apr 13 20:00–24:00 Apr 14 00:00–01:00, 20:00–24:00 Apr 15 00:00–05:00, 20:00–24:00 Apr 16 00:00–05:00, 21:00–24:00 Apr 17 00:00–05:00, 21:00–24:00 Apr 18 00:00–05:00 Apr 20 12:00–18:00 Apr 21 20:00–24:00 Apr 22 00:00–05:00, 20:00–24:00 Apr 23 00:00–05:00, 21:00–24:00 Apr 24 00:00–05:00, 21:00–24:00 Apr 25 00:00–05:00, 20:00–24:00 Apr 26 00:00–04:00 Apr 29 07:00–11:00, 20:00–24:00 Apr 30 00:00–05:00, 20:00–24:00
May
May 1 00:00–05:00, 21:00–24:00 May 2 00:00–05:00, 21:00–24:00 May 3 00:00–06:00 May 5 20:00–24:00 May 6 00:00–05:00, 12:00–16:00, 20:00–24:00 May 7 00:00–05:00, 20:00–24:00 May 8 00:00–06:00, 20:00–24:00 May 9 00:00–05:00, 21:00–24:00 May 10 00:00–05:00 May 12 20:00–24:00 May 13 00:00–05:00, 21:00–24:00 May 14 00:00–05:00, 21:00–24:00 May 15 00:00–06:00, 21:00–24:00 May 16 00:00–05:00, 21:00–24:00 May 17 00:00–05:00 May 19 20:00–24:00 May 20 00:00–05:00, 21:00–24:00 May 21 00:00–04:00, 21:00–24:00 May 22 00:00–04:00, 21:00–24:00 May 23 00:00–04:00, 21:00–24:00 May 24 00:00–05:00 May 26 20:00–24:00 May 27 00:00–05:00, 21:00–24:00 May 28 00:00–05:00, 21:00–24:00 May 29 00:00–04:00, 21:00–24:00 May 30 00:00–05:00, 21:00–24:00 May 31 00:00–05:00, 19:00–22:00
June
Jun 2 20:00–24:00 Jun 3 00:00–04:00, 20:00–24:00 Jun 4 00:00–04:00, 10:00–16:00 Jun 5 01:00–07:00, 12:00–15:00, 20:00–24:00 Jun 6 00:00–04:00, 20:00–24:00 Jun 7 00:00–05:00, 20:00–24:00 Jun 9 20:00–24:00 Jun 10 00:00–05:00, 20:00–24:00 Jun 11 00:00–05:00, 20:00–24:00 Jun 12 00:00–04:00, 09:00–16:00, 20:00–24:00 Jun 13 00:00–04:00, 21:00–24:00 Jun 14 00:00–06:00, 13:00–19:00 Jun 16 20:00–24:00 Jun 17 00:00–05:00, 20:00–24:00 Jun 18 00:00–05:00, 21:00–24:00 Jun 19 00:00–05:00, 21:00–24:00 Jun 20 00:00–05:00, 12:00–19:00 Jun 23 18:00–24:00 Jun 24 00:00–05:00, 21:00–24:00 Jun 25 00:00–05:00, 21:00–24:00 Jun 26 00:00–05:00, 21:00–24:00 Jun 27 00:00–03:00, 20:00–24:00 Jun 28 00:00–04:00 Jun 30 20:00–24:00
July
Jul 1 00:00–05:00, 21:00–24:00 Jul 2 00:00–05:00, 21:00–24:00 Jul 3 00:00–05:00, 21:00–24:00 Jul 4 00:00–05:00, 21:00–24:00 Jul 5 00:00–05:00 Jul 7 20:00–24:00 Jul 8 00:00–05:00, 20:00–24:00 Jul 9 00:00–05:00, 20:00–24:00 Jul 10 00:00–05:00, 21:00–24:00 Jul 11 00:00–05:00, 20:00–24:00 Jul 12 00:00–05:00 Jul 14 20:00–24:00 Jul 15 00:00–03:00, 12:00–17:00, 21:00–24:00 Jul 16 00:00–05:00, 20:00–24:00 Jul 17 00:00–05:00, 21:00–24:00 Jul 18 00:00–05:00, 16:00–24:00 Jul 19 00:00–06:00 Jul 21 20:00–24:00 Jul 22 00:00–04:00, 20:00–24:00 Jul 23 00:00–05:00, 21:00–24:00 Jul 24 00:00–05:00, 21:00–24:00 Jul 25 00:00–04:00, 10:00–16:00, 21:00–24:00 Jul 26 00:00–05:00, 12:00–15:00 Jul 28 17:00–24:00 Jul 29 00:00–03:00, 20:00–24:00 Jul 30 00:00–04:00, 11:00–14:00, 16:00–24:00 Jul 31 00:00–04:00, 20:00–24:00
August
Aug 1 00:00–05:00, 21:00–24:00 Aug 2 00:00–05:00, 15:00–18:00 Aug 4 20:00–24:00 Aug 5 00:00–01:00, 20:00–24:00 Aug 6 00:00–03:00, 14:00–21:00, 23:00–24:00 Aug 7 00:00–03:00, 16:00–24:00 Aug 8 00:00–06:00, 20:00–24:00 Aug 9 00:00–05:00 Aug 11 20:00–24:00 Aug 12 00:00–05:00, 20:00–24:00 Aug 13 00:00–05:00, 20:00–24:00 Aug 14 00:00–05:00, 21:00–24:00 Aug 15 00:00–05:00, 20:00–24:00 Aug 16 00:00–06:00, 14:00–18:00 Aug 18 20:00–24:00 Aug 19 00:00–07:00, 16:00–19:00, 21:00–24:00 Aug 20 00:00–05:00, 20:00–24:00 Aug 21 00:00–07:00, 21:00–24:00 Aug 22 00:00–07:00, 20:00–24:00 Aug 23 00:00–07:00 Aug 24 20:00–24:00 Aug 25 00:00–02:00, 20:00–24:00 Aug 26 00:00–07:00, 21:00–24:00 Aug 27 00:00–06:00, 21:00–24:00 Aug 28 00:00–06:00, 20:00–24:00 Aug 29 00:00–06:00, 20:00–24:00 Aug 30 00:00–04:00 Aug 31 20:00–24:00
September
Sep 1 20:00–24:00 Sep 2 00:00–07:00, 20:00–24:00 Sep 3 00:00–05:00, 20:00–24:00 Sep 4 00:00–07:00, 15:00–20:00, 22:00–24:00 Sep 5 00:00–07:00, 20:00–24:00 Sep 6 00:00–07:00, 13:00–17:00 Sep 8 20:00–24:00 Sep 9 00:00–07:00, 16:00–24:00 Sep 10 00:00–07:00, 20:00–24:00 Sep 11 00:00–07:00, 20:00–24:00 Sep 12 00:00–07:00, 20:00–24:00 Sep 13 00:00–06:00 Sep 15 00:00–10:00 Sep 16 00:00–09:00 Sep 17 00:00–06:00, 14:00–19:00 Sep 18 01:00–08:00 Sep 19 01:00–08:00, 14:00–18:00 Sep 20 01:00–07:00 Sep 22 20:00–24:00 Sep 23 00:00–06:00, 20:00–24:00 Sep 24 00:00–08:00, 20:00–24:00 Sep 25 00:00–07:00, 21:00–24:00 Sep 26 00:00–05:00, 20:00–24:00 Sep 27 00:00–05:00 Sep 28 20:00–24:00 Sep 29 00:00–08:00, 20:00–24:00 Sep 30 00:00–07:00