Most often in March, 27 days.
Highest follower count seen that year: 9,718.
January
Jan 4 20:00–24:00 Jan 5 00:00–02:00, 20:00–24:00 Jan 6 00:00–01:00, 21:00–24:00 Jan 7 00:00–02:00, 21:00–24:00 Jan 8 00:00–02:00 Jan 9 20:00–24:00 Jan 10 00:00–02:00, 20:00–24:00 Jan 11 00:00–03:00 Jan 14 21:00–24:00 Jan 15 00:00–02:00 Jan 17 00:00–02:00, 20:00–24:00 Jan 18 00:00–02:00, 20:00–24:00 Jan 19 00:00–02:00 Jan 20 19:00–22:00 Jan 21 00:00–02:00 Jan 22 21:00–24:00 Jan 23 00:00–02:00 Jan 24 20:00–24:00 Jan 25 00:00–02:00, 20:00–24:00 Jan 26 00:00–02:00, 20:00–24:00 Jan 27 00:00–01:00 Jan 28 20:00–24:00 Jan 29 00:00–02:00 Jan 30 20:00–24:00 Jan 31 00:00–02:00, 20:00–24:00
February
Feb 2 20:00–24:00 Feb 3 00:00–01:00, 20:00–24:00 Feb 4 00:00–01:00, 22:00–24:00 Feb 5 00:00–02:00 Feb 6 22:00–24:00 Feb 7 00:00–02:00 Feb 8 20:00–24:00 Feb 9 00:00–02:00 Feb 10 20:00–24:00 Feb 11 00:00–01:00, 19:00–24:00 Feb 12 00:00–02:00, 20:00–24:00 Feb 13 00:00–02:00 Feb 14 19:00–24:00 Feb 15 00:00–02:00, 20:00–24:00 Feb 16 00:00–01:00 Feb 17 03:00–11:00 Feb 18 04:00–10:00 Feb 21 04:00–09:00 Feb 22 03:00–07:00 Feb 24 04:00–10:00 Feb 25 04:00–10:00 Feb 27 04:00–07:00 Feb 28 20:00–24:00
March
Mar 1 00:00–02:00 Mar 2 20:00–24:00 Mar 3 00:00–02:00, 19:00–24:00 Mar 4 00:00–02:00, 20:00–24:00 Mar 5 00:00–02:00 Mar 6 20:00–24:00 Mar 7 00:00–02:00 Mar 9 19:00–24:00 Mar 10 00:00–02:00, 20:00–24:00 Mar 11 00:00–02:00, 20:00–24:00 Mar 12 00:00–02:00, 20:00–24:00 Mar 13 01:00–03:00 Mar 14 19:00–24:00 Mar 15 00:00–02:00 Mar 16 21:00–24:00 Mar 17 00:00–02:00, 20:00–24:00 Mar 18 00:00–02:00, 20:00–24:00 Mar 20 19:00–24:00 Mar 21 00:00–02:00, 19:00–24:00 Mar 22 00:00–02:00 Mar 25 20:00–24:00 Mar 26 00:00–02:00, 19:00–24:00 Mar 27 00:00–02:00, 20:00–24:00 Mar 28 00:00–02:00, 20:00–24:00 Mar 29 00:00–02:00, 20:00–24:00 Mar 30 00:00–02:00, 21:00–24:00 Mar 31 00:00–02:00
April
Apr 1 20:00–24:00 Apr 2 00:00–02:00, 20:00–24:00 Apr 3 00:00–02:00, 20:00–24:00 Apr 4 00:00–02:00, 22:00–24:00 Apr 5 00:00–02:00 Apr 6 21:00–22:00 Apr 7 00:00–02:00, 20:00–24:00 Apr 8 00:00–02:00, 21:00–24:00 Apr 9 00:00–02:00 Apr 11 20:00–24:00 Apr 12 00:00–03:00, 20:00–24:00 Apr 13 00:00–02:00 Apr 14 20:00–24:00 Apr 15 00:00–02:00, 21:00–24:00 Apr 16 00:00–02:00, 20:00–24:00 Apr 17 00:00–02:00 Apr 20 21:00–24:00 Apr 21 00:00–01:00, 20:00–24:00 Apr 22 00:00–01:00, 20:00–24:00 Apr 23 00:00–02:00, 19:00–24:00 Apr 24 00:00–02:00, 19:00–24:00 Apr 25 00:00–03:00, 20:00–24:00 Apr 26 00:00–01:00 Apr 28 20:00–24:00 Apr 29 00:00–02:00, 21:00–24:00 Apr 30 00:00–02:00, 20:00–24:00
May
May 1 00:00–02:00, 20:00–24:00 May 2 00:00–02:00, 20:00–22:00 May 4 20:00–23:00 May 5 20:00–24:00 May 6 00:00–01:00, 20:00–24:00 May 7 00:00–01:00 May 8 03:00–07:00 May 9 19:00–24:00 May 10 00:00–01:00 May 12 20:00–23:00 May 13 21:00–24:00 May 14 00:00–01:00, 20:00–24:00 May 15 20:00–24:00 May 16 00:00–01:00, 20:00–24:00 May 19 20:00–24:00 May 20 00:00–01:00, 20:00–24:00 May 21 00:00–01:00, 19:00–24:00 May 22 00:00–01:00, 20:00–24:00 May 26 21:00–24:00 May 27 00:00–01:00, 20:00–24:00 May 28 00:00–01:00, 20:00–24:00 May 29 00:00–01:00, 19:00–23:00 May 30 21:00–22:00
June
Jun 2 20:00–24:00 Jun 3 00:00–01:00, 21:00–24:00 Jun 4 00:00–02:00 Jun 5 20:00–24:00 Jun 7 21:00–24:00 Jun 8 00:00–01:00, 20:00–24:00 Jun 9 00:00–01:00, 19:00–24:00 Jun 11 20:00–24:00 Jun 12 00:00–01:00, 20:00–24:00 Jun 13 00:00–02:00 Jun 14 20:00–24:00 Jun 15 00:00–02:00 Jun 16 20:00–24:00 Jun 17 00:00–01:00, 20:00–24:00 Jun 18 20:00–24:00 Jun 19 00:00–01:00, 20:00–24:00 Jun 20 00:00–01:00, 22:00–24:00 Jun 21 00:00–01:00 Jun 23 20:00–24:00 Jun 24 00:00–01:00, 20:00–24:00 Jun 25 00:00–01:00, 20:00–23:00 Jun 26 20:00–24:00 Jun 27 00:00–01:00, 20:00–24:00
July
Jul 1 20:00–24:00 Jul 2 00:00–02:00, 20:00–24:00 Jul 3 00:00–01:00, 21:00–24:00 Jul 4 00:00–02:00 Jul 7 20:00–24:00 Jul 8 00:00–01:00, 20:00–24:00 Jul 9 00:00–01:00, 19:00–24:00 Jul 10 19:00–24:00 Jul 11 00:00–01:00 Jul 14 20:00–22:00 Jul 15 20:00–24:00 Jul 16 00:00–01:00, 19:00–24:00 Jul 17 00:00–01:00 Jul 18 20:00–24:00 Jul 19 00:00–02:00 Jul 21 19:00–22:00
August
Aug 6 03:00–09:00 Aug 7 03:00–09:00 Aug 8 03:00–10:00 Aug 9 04:00–09:00 Aug 19 03:00–10:00 Aug 20 06:00–08:00 Aug 21 03:00–09:00 Aug 25 04:00–10:00 Aug 27 03:00–09:00 Aug 28 03:00–09:00 Aug 29 03:00–06:00 Aug 30 03:00–10:00
September
Sep 2 03:00–10:00 Sep 3 23:00–24:00 Sep 4 00:00–09:00 Sep 6 03:00–09:00 Sep 8 06:00–10:00 Sep 9 04:00–10:00 Sep 10 04:00–09:00 Sep 12 03:00–09:00 Sep 13 04:00–10:00 Sep 16 03:00–09:00 Sep 19 04:00–12:00 Sep 23 03:00–10:00 Sep 24 03:00–10:00 Sep 25 03:00–10:00 Sep 26 03:00–08:00 Sep 30 03:00–10:00
October
Oct 1 04:00–08:00 Oct 3 04:00–10:00 Oct 8 05:00–09:00 Oct 10 04:00–09:00 Oct 11 04:00–07:00 Oct 13 04:00–10:00 Oct 15 04:00–09:00 Oct 16 03:00–09:00 Oct 18 04:00–11:00 Oct 21 04:00–11:00 Oct 23 03:00–11:00 Oct 25 04:00–10:00 Oct 29 03:00–09:00 Oct 31 05:00–10:00
November
Nov 6 04:00–11:00 Nov 8 05:00–11:00 Nov 11 04:00–10:00 Nov 12 04:00–10:00 Nov 13 02:00–08:00 Nov 14 04:00–10:00 Nov 18 04:00–09:00 Nov 22 03:00–08:00 Nov 25 04:00–12:00 Nov 26 05:00–09:00 Nov 28 03:00–08:00 Nov 29 03:00–09:00
December
Dec 2 03:00–10:00 Dec 3 04:00–10:00 Dec 4 04:00–10:00 Dec 10 04:00–09:00 Dec 12 04:00–09:00 Dec 13 03:00–07:00 Dec 17 00:00–08:00 Dec 19 04:00–09:00 Dec 24 03:00–08:00