Most often in July, 27 days.
Highest follower count seen that year: 82,830.
January
Jan 28 19:00–24:00 Jan 29 00:00–02:00, 19:00–24:00 Jan 30 00:00–03:00, 19:00–24:00 Jan 31 00:00–04:00, 21:00–24:00
February
Feb 1 00:00–06:00, 19:00–24:00 Feb 2 00:00–04:00, 19:00–24:00 Feb 3 00:00–03:00, 19:00–24:00 Feb 4 00:00–04:00 Feb 6 19:00–24:00 Feb 7 00:00–04:00, 21:00–24:00 Feb 8 00:00–05:00, 19:00–24:00 Feb 9 00:00–04:00, 19:00–24:00 Feb 10 00:00–03:00 Feb 12 19:00–24:00 Feb 13 00:00–04:00, 19:00–24:00 Feb 14 00:00–03:00, 21:00–24:00 Feb 15 00:00–06:00, 19:00–24:00 Feb 16 00:00–04:00, 18:00–24:00 Feb 17 00:00–03:00 Feb 19 19:00–24:00 Feb 20 00:00–04:00, 19:00–24:00 Feb 21 00:00–04:00, 21:00–24:00 Feb 22 00:00–05:00, 19:00–24:00 Feb 23 00:00–03:00, 19:00–24:00 Feb 24 00:00–04:00, 19:00–24:00 Feb 25 00:00–04:00, 19:00–24:00 Feb 26 20:00–24:00 Feb 27 00:00–05:00, 20:00–24:00 Feb 28 00:00–04:00
March
Mar 2 20:00–24:00 Mar 3 00:00–05:00 Mar 5 21:00–24:00 Mar 6 00:00–05:00, 20:00–24:00 Mar 7 00:00–04:00, 21:00–24:00 Mar 8 00:00–02:00, 20:00–24:00 Mar 9 00:00–05:00, 19:00–24:00 Mar 10 00:00–05:00 Mar 12 20:00–24:00 Mar 13 00:00–04:00, 20:00–24:00 Mar 14 00:00–04:00, 21:00–24:00 Mar 15 00:00–06:00, 20:00–24:00 Mar 16 00:00–04:00, 20:00–24:00 Mar 17 00:00–04:00 Mar 19 20:00–24:00 Mar 20 00:00–05:00, 20:00–24:00 Mar 21 00:00–04:00, 21:00–24:00 Mar 22 00:00–06:00, 20:00–24:00 Mar 23 00:00–04:00, 20:00–24:00 Mar 24 00:00–05:00 Mar 26 20:00–24:00 Mar 27 00:00–04:00, 20:00–24:00 Mar 28 00:00–04:00, 22:00–24:00 Mar 29 00:00–03:00, 20:00–24:00 Mar 30 00:00–04:00, 21:00–24:00 Mar 31 00:00–05:00
April
Apr 2 06:00–14:00 Apr 3 07:00–16:00 Apr 4 07:00–16:00 Apr 5 07:00–08:00, 10:00–17:00 Apr 6 07:00–15:00 Apr 9 07:00–15:00 Apr 10 07:00–15:00 Apr 11 08:00–17:00 Apr 12 08:00–17:00 Apr 13 07:00–13:00 Apr 16 07:00–15:00 Apr 17 07:00–16:00 Apr 18 07:00–13:00 Apr 19 08:00–16:00 Apr 20 08:00–16:00 Apr 23 07:00–15:00 Apr 24 07:00–17:00 Apr 25 07:00–16:00 Apr 26 07:00–16:00 Apr 27 07:00–16:00 Apr 30 07:00–16:00
May
May 1 07:00–15:00 May 2 07:00–15:00 May 3 07:00–16:00 May 4 07:00–16:00 May 7 07:00–15:00 May 8 07:00–16:00 May 9 07:00–15:00 May 10 07:00–16:00 May 11 07:00–16:00 May 13 08:00–16:00 May 14 06:00–14:00 May 28 07:00–15:00 May 29 07:00–10:00 May 30 07:00–16:00 May 31 07:00–16:00
June
Jun 1 07:00–16:00 Jun 4 07:00–16:00 Jun 5 07:00–15:00 Jun 6 07:00–16:00 Jun 7 07:00–16:00 Jun 8 07:00–16:00 Jun 10 07:00–16:00 Jun 11 07:00–15:00 Jun 12 07:00–16:00 Jun 21 20:00–24:00 Jun 22 00:00–03:00, 19:00–24:00 Jun 23 00:00–04:00 Jun 25 19:00–24:00 Jun 26 00:00–03:00, 19:00–24:00 Jun 27 00:00–04:00, 19:00–24:00 Jun 28 00:00–04:00, 19:00–24:00 Jun 29 00:00–03:00, 19:00–24:00 Jun 30 00:00–04:00
July
Jul 1 20:00–24:00 Jul 2 00:00–04:00, 19:00–23:00 Jul 3 00:00–03:00, 19:00–24:00 Jul 4 00:00–04:00, 19:00–24:00 Jul 5 00:00–04:00 Jul 6 19:00–24:00 Jul 7 00:00–04:00, 19:00–24:00 Jul 8 00:00–04:00, 19:00–24:00 Jul 9 00:00–04:00, 19:00–24:00 Jul 10 00:00–04:00, 19:00–24:00 Jul 11 00:00–04:00, 19:00–24:00 Jul 12 00:00–03:00 Jul 16 19:00–24:00 Jul 17 00:00–04:00, 19:00–24:00 Jul 18 00:00–05:00, 19:00–24:00 Jul 19 00:00–04:00, 19:00–21:00, 23:00–24:00 Jul 20 00:00–02:00, 19:00–24:00 Jul 21 00:00–04:00 Jul 23 19:00–24:00 Jul 24 00:00–04:00, 19:00–24:00 Jul 25 00:00–03:00, 19:00–24:00 Jul 26 00:00–01:00, 03:00–04:00, 19:00–24:00 Jul 27 00:00–04:00, 19:00–23:00 Jul 28 00:00–04:00 Jul 29 05:00–14:00 Jul 30 07:00–15:00 Jul 31 07:00–16:00
August
Aug 1 07:00–16:00 Aug 2 07:00–16:00 Aug 6 07:00–16:00 Aug 7 07:00–15:00 Aug 8 07:00–15:00 Aug 9 07:00–16:00 Aug 10 08:00–16:00 Aug 13 07:00–15:00 Aug 14 08:00–16:00 Aug 15 07:00–15:00 Aug 16 07:00–16:00 Aug 17 07:00–16:00 Aug 23 07:00–16:00 Aug 24 07:00–16:00 Aug 26 07:00–16:00 Aug 27 07:00–15:00 Aug 28 07:00–16:00 Aug 29 07:00–16:00 Aug 30 07:00–16:00
September
Sep 10 07:00–16:00 Sep 11 07:00–16:00 Sep 12 07:00–16:00 Sep 13 07:00–16:00 Sep 14 07:00–15:00 Sep 17 07:00–16:00 Sep 18 07:00–16:00 Sep 19 07:00–16:00 Sep 20 07:00–16:00 Sep 21 07:00–16:00 Sep 24 08:00–16:00 Sep 25 07:00–15:00 Sep 26 07:00–16:00 Sep 27 07:00–15:00 Sep 28 07:00–16:00
October
Oct 1 07:00–15:00 Oct 2 07:00–15:00 Oct 3 07:00–16:00 Oct 4 07:00–16:00 Oct 5 07:00–16:00 Oct 8 07:00–15:00 Oct 9 07:00–15:00 Oct 10 07:00–16:00 Oct 11 07:00–15:00 Oct 12 07:00–16:00 Oct 15 07:00–16:00 Oct 16 07:00–16:00 Oct 17 07:00–16:00 Oct 18 07:00–16:00 Oct 19 07:00–16:00 Oct 22 07:00–15:00 Oct 23 07:00–16:00 Oct 24 07:00–16:00 Oct 25 07:00–16:00 Oct 28 07:00–15:00 Oct 29 07:00–16:00 Oct 30 07:00–16:00 Oct 31 07:00–15:00
November
Nov 1 07:00–16:00 Nov 2 07:00–16:00 Nov 3 07:00–15:00 Nov 4 07:00–15:00 Nov 5 07:00–16:00 Nov 6 07:00–15:00 Nov 7 07:00–16:00 Nov 13 07:00–16:00 Nov 14 07:00–15:00 Nov 15 07:00–15:00 Nov 16 08:00–16:00 Nov 17 07:00–16:00 Nov 19 07:00–15:00 Nov 20 07:00–16:00 Nov 21 07:00–16:00 Nov 22 07:00–16:00 Nov 23 07:00–15:00 Nov 26 07:00–15:00 Nov 27 07:00–15:00 Nov 28 07:00–15:00 Nov 29 07:00–16:00 Nov 30 07:00–16:00
December
Dec 3 07:00–15:00 Dec 4 07:00–15:00 Dec 5 07:00–16:00 Dec 6 07:00–16:00 Dec 7 07:00–16:00 Dec 10 07:00–15:00 Dec 11 07:00–16:00 Dec 12 07:00–16:00 Dec 13 07:00–16:00 Dec 14 07:00–16:00 Dec 17 07:00–15:00 Dec 18 07:00–15:00 Dec 19 07:00–16:00 Dec 20 07:00–16:00 Dec 21 07:00–16:00 Dec 23 07:00–16:00 Dec 24 07:00–15:00 Dec 25 07:00–16:00 Dec 27 07:00–16:00 Dec 28 07:00–16:00