Most often in September, 27 days.
Highest follower count seen that year: 2,967.
January
Jan 1 17:00–20:00 Jan 2 20:00–21:00 Jan 3 20:00–21:00 Jan 4 04:00–05:00, 18:00–20:00 Jan 5 03:00–04:00 Jan 6 08:00–09:00, 20:00–21:00 Jan 9 06:00–09:00 Jan 13 04:00–06:00, 08:00–09:00, 19:00–21:00 Jan 15 05:00–06:00, 20:00–21:00 Jan 18 14:00–15:00 Jan 19 18:00–20:00 Jan 21 06:00–07:00 Jan 22 04:00–09:00 Jan 26 05:00–09:00, 18:00–19:00 Jan 28 17:00–18:00, 20:00–21:00 Jan 31 04:00–06:00, 08:00–09:00, 19:00–21:00
February
Feb 1 04:00–07:00 Feb 2 05:00–08:00 Feb 3 04:00–06:00 Feb 6 05:00–08:00, 16:00–17:00 Feb 12 01:00–05:00 Feb 16 01:00–03:00 Feb 17 01:00–08:00 Feb 18 00:00–02:00, 04:00–05:00 Feb 19 02:00–03:00 Feb 20 03:00–09:00, 16:00–17:00, 23:00–24:00 Feb 21 01:00–03:00 Feb 22 00:00–05:00, 21:00–22:00 Feb 23 01:00–03:00, 07:00–10:00 Feb 24 07:00–09:00, 23:00–24:00 Feb 25 00:00–03:00, 10:00–12:00 Feb 26 08:00–12:00 Feb 27 03:00–11:00 Feb 28 08:00–10:00
March
Mar 1 08:00–09:00, 14:00–21:00 Mar 2 00:00–03:00 Mar 3 03:00–08:00, 13:00–14:00 Mar 4 09:00–10:00 Mar 5 08:00–09:00, 11:00–13:00 Mar 6 22:00–23:00 Mar 7 09:00–13:00, 23:00–24:00 Mar 8 00:00–03:00, 09:00–11:00 Mar 9 14:00–18:00, 21:00–24:00 Mar 10 00:00–04:00, 20:00–24:00 Mar 11 00:00–03:00, 21:00–24:00 Mar 12 00:00–01:00, 20:00–21:00, 23:00–24:00 Mar 13 03:00–04:00 Mar 14 23:00–24:00 Mar 15 00:00–04:00 Mar 16 23:00–24:00 Mar 17 00:00–01:00 Mar 18 00:00–01:00, 23:00–24:00 Mar 19 00:00–01:00, 03:00–04:00 Mar 24 18:00–19:00 Mar 27 16:00–17:00 Mar 30 23:00–24:00 Mar 31 00:00–02:00
April
Apr 2 15:00–16:00 Apr 3 00:00–03:00 Apr 4 23:00–24:00 Apr 5 01:00–02:00 Apr 11 22:00–24:00 Apr 18 22:00–24:00 Apr 19 00:00–01:00 Apr 21 01:00–02:00, 23:00–24:00 Apr 22 00:00–02:00 Apr 23 00:00–03:00 Apr 24 00:00–02:00, 23:00–24:00 Apr 25 00:00–03:00, 22:00–24:00 Apr 26 00:00–02:00 Apr 27 22:00–24:00 Apr 28 00:00–02:00, 22:00–24:00 Apr 29 00:00–03:00
May
May 7 00:00–02:00, 22:00–24:00 May 9 22:00–24:00 May 10 00:00–01:00 May 11 01:00–03:00 May 13 00:00–02:00 May 14 00:00–02:00, 22:00–23:00 May 17 23:00–24:00 May 18 00:00–02:00 May 19 22:00–24:00 May 20 00:00–02:00 May 21 22:00–24:00 May 22 00:00–03:00 May 23 00:00–01:00, 22:00–24:00 May 24 00:00–01:00, 22:00–24:00 May 25 00:00–02:00, 23:00–24:00 May 26 00:00–02:00, 22:00–24:00 May 27 00:00–02:00, 22:00–24:00 May 28 00:00–03:00, 23:00–24:00 May 29 00:00–04:00, 23:00–24:00 May 30 00:00–02:00 May 31 01:00–03:00, 17:00–24:00
June
Jun 1 00:00–03:00, 23:00–24:00 Jun 2 00:00–03:00, 22:00–24:00 Jun 3 00:00–03:00, 23:00–24:00 Jun 4 00:00–02:00, 21:00–24:00 Jun 5 00:00–02:00, 19:00–24:00 Jun 6 00:00–01:00 Jun 9 20:00–23:00 Jun 13 22:00–23:00 Jun 14 00:00–01:00 Jun 15 21:00–23:00 Jun 17 19:00–24:00 Jun 18 00:00–02:00 Jun 20 21:00–24:00 Jun 21 00:00–02:00 Jun 23 00:00–03:00, 21:00–24:00 Jun 24 00:00–02:00 Jun 25 22:00–24:00 Jun 26 00:00–02:00 Jun 27 22:00–24:00 Jun 28 00:00–01:00 Jun 29 22:00–24:00 Jun 30 00:00–01:00
July
Jul 2 22:00–24:00 Jul 3 00:00–02:00, 22:00–24:00 Jul 4 00:00–01:00 Jul 6 01:00–03:00 Jul 7 17:00–18:00, 22:00–24:00 Jul 8 00:00–02:00 Jul 9 22:00–24:00 Jul 10 00:00–02:00, 22:00–24:00 Jul 11 00:00–02:00 Jul 12 23:00–24:00 Jul 13 00:00–03:00, 23:00–24:00 Jul 14 00:00–03:00, 22:00–24:00 Jul 15 00:00–02:00, 10:00–12:00, 16:00–18:00, 22:00–24:00 Jul 16 00:00–02:00 Jul 17 22:00–24:00 Jul 19 22:00–24:00 Jul 20 00:00–01:00 Jul 21 00:00–02:00 Jul 23 21:00–24:00 Jul 24 00:00–02:00 Jul 25 00:00–03:00 Jul 26 20:00–23:00 Jul 27 23:00–24:00 Jul 28 00:00–01:00 Jul 29 22:00–24:00
August
Aug 2 15:00–17:00, 21:00–24:00 Aug 3 00:00–02:00 Aug 4 22:00–24:00 Aug 6 23:00–24:00 Aug 7 00:00–02:00, 19:00–23:00 Aug 8 23:00–24:00 Aug 9 00:00–02:00, 23:00–24:00 Aug 10 00:00–01:00, 23:00–24:00 Aug 11 00:00–01:00 Aug 12 22:00–24:00 Aug 14 23:00–24:00 Aug 15 00:00–02:00 Aug 17 19:00–22:00 Aug 18 22:00–24:00 Aug 19 00:00–02:00, 23:00–24:00 Aug 20 00:00–01:00 Aug 21 00:00–03:00 Aug 22 23:00–24:00 Aug 23 00:00–02:00 Aug 26 00:00–02:00 Aug 31 19:00–24:00
September
Sep 1 00:00–02:00, 23:00–24:00 Sep 2 00:00–01:00, 23:00–24:00 Sep 3 00:00–03:00, 22:00–24:00 Sep 4 00:00–03:00, 21:00–24:00 Sep 5 00:00–03:00, 21:00–24:00 Sep 6 00:00–02:00, 22:00–24:00 Sep 7 00:00–04:00, 22:00–24:00 Sep 8 00:00–03:00 Sep 9 00:00–03:00, 23:00–24:00 Sep 10 00:00–03:00, 22:00–24:00 Sep 11 00:00–02:00, 22:00–23:00 Sep 12 21:00–24:00 Sep 13 22:00–24:00 Sep 14 00:00–01:00 Sep 15 22:00–24:00 Sep 16 00:00–03:00 Sep 18 20:00–24:00 Sep 20 23:00–24:00 Sep 21 00:00–03:00 Sep 22 00:00–03:00, 23:00–24:00 Sep 23 00:00–03:00, 21:00–24:00 Sep 24 00:00–02:00, 22:00–24:00 Sep 25 00:00–02:00 Sep 27 22:00–24:00 Sep 28 00:00–02:00 Sep 29 23:00–24:00 Sep 30 00:00–02:00
October
Oct 1 23:00–24:00 Oct 2 00:00–01:00 Oct 3 23:00–24:00 Oct 4 00:00–01:00 Oct 8 22:00–23:00 Oct 12 23:00–24:00 Oct 15 23:00–24:00 Oct 16 00:00–02:00, 23:00–24:00 Oct 17 00:00–01:00, 22:00–24:00 Oct 18 00:00–02:00 Oct 23 21:00–23:00 Oct 25 14:00–15:00, 22:00–24:00 Oct 26 00:00–01:00 Oct 27 23:00–24:00 Oct 28 00:00–01:00 Oct 30 00:00–01:00
November
Nov 6 20:00–23:00 Nov 7 23:00–24:00 Nov 8 00:00–04:00 Nov 10 00:00–04:00 Nov 12 00:00–02:00 Nov 14 00:00–02:00 Nov 15 00:00–02:00, 23:00–24:00 Nov 16 00:00–03:00 Nov 18 00:00–04:00, 23:00–24:00 Nov 19 00:00–03:00, 15:00–19:00 Nov 21 00:00–03:00 Nov 22 23:00–24:00 Nov 23 00:00–03:00, 23:00–24:00 Nov 24 00:00–03:00, 23:00–24:00 Nov 25 00:00–04:00 Nov 28 00:00–02:00
December
Dec 2 23:00–24:00 Dec 3 00:00–01:00 Dec 4 00:00–01:00 Dec 5 00:00–04:00 Dec 6 01:00–03:00 Dec 7 01:00–03:00 Dec 8 23:00–24:00 Dec 9 00:00–02:00 Dec 10 00:00–03:00, 23:00–24:00 Dec 11 00:00–03:00 Dec 12 01:00–04:00 Dec 13 01:00–03:00 Dec 14 01:00–04:00 Dec 15 00:00–04:00 Dec 16 00:00–03:00 Dec 17 23:00–24:00 Dec 18 00:00–02:00 Dec 21 22:00–24:00 Dec 22 00:00–01:00 Dec 23 00:00–03:00 Dec 29 00:00–01:00, 23:00–24:00 Dec 30 00:00–03:00 Dec 31 01:00–04:00