Most often in March, 27 days.
Highest follower count seen that year: 6,723.
January
Jan 13 19:00–24:00 Jan 14 00:00–06:00 Jan 16 18:00–24:00 Jan 17 00:00–06:00 Jan 19 18:00–24:00 Jan 20 00:00–06:00, 18:00–24:00 Jan 21 01:00–06:00, 18:00–24:00 Jan 22 00:00–06:00 Jan 23 18:00–22:00 Jan 24 02:00–06:00, 18:00–24:00 Jan 25 00:00–06:00, 18:00–24:00 Jan 26 00:00–06:00 Jan 28 18:00–24:00 Jan 29 00:00–05:00 Jan 30 20:00–24:00 Jan 31 00:00–06:00, 18:00–24:00
February
Feb 1 00:00–02:00, 05:00–06:00, 22:00–24:00 Feb 2 00:00–07:00, 22:00–23:00 Feb 3 01:00–06:00, 19:00–24:00 Feb 4 00:00–06:00, 18:00–24:00 Feb 5 00:00–06:00, 21:00–24:00 Feb 6 00:00–05:00, 22:00–23:00 Feb 7 00:00–06:00 Feb 9 18:00–24:00 Feb 10 00:00–06:00, 22:00–24:00 Feb 11 01:00–03:00, 18:00–23:00 Feb 12 00:00–01:00, 03:00–06:00 Feb 13 18:00–20:00, 22:00–24:00 Feb 14 00:00–06:00 Feb 16 18:00–24:00 Feb 17 00:00–06:00 Feb 18 01:00–06:00, 21:00–24:00 Feb 19 00:00–07:00 Feb 20 19:00–24:00 Feb 21 00:00–06:00, 18:00–23:00 Feb 22 00:00–06:00 Feb 23 18:00–24:00 Feb 24 00:00–06:00, 18:00–24:00 Feb 25 00:00–06:00, 21:00–23:00 Feb 26 00:00–06:00 Feb 27 19:00–24:00 Feb 28 00:00–06:00
March
Mar 2 18:00–24:00 Mar 3 00:00–06:00, 19:00–24:00 Mar 4 00:00–06:00, 19:00–22:00 Mar 5 00:00–03:00 Mar 6 18:00–23:00 Mar 7 00:00–06:00 Mar 9 18:00–24:00 Mar 10 00:00–08:00, 18:00–24:00 Mar 11 00:00–06:00, 18:00–24:00 Mar 12 00:00–02:00, 04:00–06:00 Mar 13 18:00–24:00 Mar 14 00:00–05:00 Mar 16 18:00–24:00 Mar 17 00:00–06:00, 18:00–24:00 Mar 18 00:00–06:00, 20:00–24:00 Mar 19 00:00–06:00 Mar 20 21:00–24:00 Mar 21 00:00–09:00, 11:00–12:00, 14:00–16:00 Mar 23 20:00–24:00 Mar 24 00:00–06:00, 18:00–24:00 Mar 25 00:00–01:00, 03:00–06:00 Mar 26 01:00–11:00 Mar 27 18:00–23:00 Mar 28 00:00–06:00, 22:00–24:00 Mar 29 02:00–10:00 Mar 30 18:00–24:00 Mar 31 00:00–06:00, 19:00–24:00
April
Apr 1 01:00–06:00, 19:00–24:00 Apr 2 00:00–06:00 Apr 3 21:00–23:00 Apr 4 00:00–07:00 Apr 6 21:00–24:00 Apr 7 00:00–04:00, 19:00–24:00 Apr 8 00:00–05:00, 23:00–24:00 Apr 9 00:00–10:00 Apr 10 19:00–23:00 Apr 11 00:00–06:00 Apr 13 20:00–24:00 Apr 14 00:00–05:00, 19:00–22:00 Apr 15 00:00–06:00, 18:00–24:00 Apr 16 01:00–02:00, 05:00–06:00 Apr 17 19:00–24:00 Apr 18 00:00–05:00 Apr 20 21:00–24:00 Apr 21 02:00–06:00, 18:00–24:00 Apr 22 00:00–06:00, 19:00–21:00 Apr 23 00:00–06:00 Apr 24 19:00–24:00 Apr 25 02:00–06:00, 21:00–24:00 Apr 26 00:00–06:00 Apr 27 19:00–24:00 Apr 28 00:00–01:00, 23:00–24:00 Apr 29 00:00–08:00
May
May 1 18:00–24:00 May 2 03:00–06:00 May 4 18:00–23:00 May 5 04:00–06:00, 19:00–24:00 May 6 00:00–06:00, 19:00–24:00 May 7 00:00–07:00 May 8 18:00–24:00 May 9 00:00–01:00, 04:00–06:00 May 15 18:00–24:00 May 16 00:00–06:00 May 18 18:00–24:00 May 19 00:00–06:00, 18:00–24:00 May 20 00:00–07:00, 22:00–24:00 May 21 00:00–16:00 May 22 18:00–24:00 May 23 01:00–02:00, 05:00–06:00 May 25 18:00–24:00 May 26 00:00–02:00, 04:00–05:00, 19:00–23:00 May 27 00:00–06:00, 18:00–24:00 May 28 00:00–01:00, 04:00–06:00 May 29 22:00–24:00 May 30 00:00–06:00
June
Jun 2 18:00–24:00 Jun 3 00:00–06:00 Jun 5 20:00–24:00 Jun 6 00:00–03:00, 05:00–06:00 Jun 8 20:00–23:00 Jun 9 00:00–06:00, 20:00–24:00 Jun 10 00:00–06:00 Jun 13 20:00–24:00 Jun 14 00:00–05:00 Jun 15 21:00–24:00 Jun 16 05:00–06:00 Jun 17 20:00–24:00 Jun 18 00:00–06:00, 20:00–24:00 Jun 19 00:00–06:00, 22:00–24:00 Jun 20 00:00–06:00 Jun 22 20:00–24:00 Jun 23 00:00–06:00, 19:00–24:00 Jun 24 00:00–05:00 Jun 25 06:00–18:00 Jun 27 23:00–24:00 Jun 28 00:00–03:00, 05:00–06:00, 18:00–24:00 Jun 29 00:00–06:00, 19:00–24:00 Jun 30 00:00–06:00
July
Jul 2 18:00–24:00 Jul 3 00:00–03:00, 05:00–06:00, 18:00–24:00 Jul 4 00:00–06:00 Jul 6 18:00–23:00 Jul 7 02:00–03:00, 05:00–06:00 Jul 10 19:00–24:00 Jul 11 02:00–06:00, 18:00–24:00 Jul 12 00:00–06:00, 18:00–24:00 Jul 13 00:00–06:00, 18:00–24:00 Jul 14 00:00–03:00, 05:00–06:00, 18:00–24:00 Jul 15 02:00–06:00 Jul 16 07:00–18:00 Jul 17 22:00–24:00 Jul 18 00:00–01:00, 03:00–06:00 Jul 19 19:00–24:00 Jul 20 00:00–06:00, 19:00–24:00 Jul 21 00:00–06:00
August
Aug 4 18:00–23:00 Aug 5 00:00–01:00 Aug 6 06:00–11:00, 13:00–18:00 Aug 11 18:00–19:00, 22:00–24:00 Aug 12 00:00–01:00, 04:00–06:00 Aug 13 06:00–18:00 Aug 14 22:00–24:00 Aug 15 00:00–06:00 Aug 20 07:00–18:00 Aug 21 20:00–24:00 Aug 22 00:00–06:00, 20:00–24:00 Aug 23 00:00–06:00, 20:00–24:00 Aug 24 00:00–06:00, 23:00–24:00 Aug 25 00:00–07:00, 21:00–23:00 Aug 26 00:00–06:00 Aug 27 08:00–18:00 Aug 30 19:00–24:00 Aug 31 00:00–06:00, 21:00–24:00
September
Sep 1 00:00–06:00 Sep 2 18:00–24:00 Sep 3 00:00–09:00 Sep 7 19:00–24:00 Sep 8 00:00–06:00, 18:00–24:00 Sep 9 00:00–06:00 Sep 10 18:00–24:00 Sep 11 00:00–06:00 Sep 12 18:00–24:00 Sep 13 00:00–06:00, 18:00–24:00 Sep 14 00:00–06:00, 18:00–24:00 Sep 15 00:00–06:00, 18:00–24:00 Sep 16 00:00–01:00, 05:00–06:00 Sep 17 06:00–16:00 Sep 18 19:00–24:00 Sep 19 00:00–06:00 Sep 20 09:00–21:00 Sep 22 02:00–08:00 Sep 24 07:00–18:00 Sep 25 18:00–21:00 Sep 26 02:00–05:00, 18:00–24:00 Sep 27 00:00–06:00 Sep 29 18:00–24:00 Sep 30 00:00–01:00, 04:00–06:00
October
Oct 1 07:00–18:00 Oct 3 18:00–24:00 Oct 4 00:00–06:00, 18:00–24:00 Oct 5 00:00–04:00, 06:00–07:00 Oct 8 11:00–19:00 Oct 9 19:00–24:00 Oct 10 00:00–01:00, 05:00–06:00 Oct 11 20:00–24:00 Oct 12 00:00–03:00, 05:00–07:00, 18:00–24:00 Oct 13 00:00–06:00, 18:00–24:00 Oct 14 00:00–06:00 Oct 15 11:00–18:00 Oct 17 07:00–15:00 Oct 20 18:00–24:00 Oct 21 00:00–06:00 Oct 22 06:00–14:00, 16:00–18:00 Oct 23 19:00–20:00, 23:00–24:00 Oct 24 00:00–01:00, 03:00–06:00, 18:00–24:00 Oct 25 00:00–06:00 Oct 26 18:00–24:00 Oct 27 00:00–06:00, 19:00–24:00 Oct 28 00:00–06:00 Oct 29 07:00–18:00 Oct 30 21:00–24:00 Oct 31 00:00–03:00, 05:00–06:00
November
Nov 1 00:00–10:00 Nov 2 20:00–24:00 Nov 3 00:00–04:00 Nov 4 03:00–06:00 Nov 5 06:00–18:00 Nov 6 18:00–24:00 Nov 7 00:00–07:00 Nov 8 07:00–16:00 Nov 9 19:00–24:00 Nov 10 00:00–01:00, 03:00–05:00, 21:00–24:00 Nov 11 00:00–06:00 Nov 12 08:00–18:00 Nov 13 19:00–23:00 Nov 14 03:00–04:00 Nov 16 18:00–24:00 Nov 17 00:00–06:00 Nov 19 11:00–18:00 Nov 20 18:00–24:00 Nov 21 00:00–05:00 Nov 22 11:00–18:00 Nov 23 19:00–24:00 Nov 24 00:00–05:00 Nov 25 06:00–19:00 Nov 26 13:00–18:00 Nov 27 18:00–24:00 Nov 28 00:00–04:00 Nov 30 18:00–24:00
December
Dec 1 00:00–06:00 Dec 3 06:00–13:00, 15:00–18:00 Dec 4 18:00–24:00 Dec 5 00:00–05:00 Dec 6 07:00–14:00, 16:00–17:00 Dec 7 19:00–24:00 Dec 8 00:00–06:00 Dec 10 19:00–24:00 Dec 11 00:00–06:00 Dec 13 06:00–11:00 Dec 15 00:00–06:00 Dec 16 15:00–19:00 Dec 17 07:00–16:00 Dec 18 18:00–24:00 Dec 20 14:00–18:00 Dec 21 18:00–23:00 Dec 22 03:00–06:00 Dec 23 12:00–18:00 Dec 24 13:00–18:00 Dec 25 18:00–24:00 Dec 26 00:00–03:00, 05:00–06:00 Dec 27 07:00–18:00 Dec 28 18:00–22:00 Dec 29 00:00–04:00 Dec 30 18:00–24:00 Dec 31 00:00–06:00