Most often in March, 30 days.
Highest follower count seen that year: 86,553.
January
Jan 2 23:00–24:00 Jan 3 00:00–06:00, 18:00–24:00 Jan 4 00:00–02:00, 19:00–24:00 Jan 5 00:00–03:00, 19:00–24:00 Jan 6 00:00–04:00, 18:00–24:00 Jan 7 00:00–03:00, 17:00–24:00 Jan 8 00:00–01:00 Jan 9 18:00–24:00 Jan 10 00:00–02:00, 18:00–24:00 Jan 11 00:00–03:00, 18:00–24:00 Jan 12 00:00–03:00, 18:00–24:00 Jan 13 00:00–03:00, 18:00–24:00 Jan 14 00:00–03:00, 18:00–24:00 Jan 15 00:00–03:00, 19:00–24:00 Jan 16 00:00–03:00, 17:00–24:00 Jan 17 00:00–02:00, 18:00–24:00 Jan 18 00:00–03:00, 18:00–24:00 Jan 19 00:00–03:00, 18:00–24:00 Jan 20 00:00–03:00, 18:00–24:00 Jan 21 00:00–03:00, 18:00–24:00 Jan 22 00:00–03:00, 18:00–24:00 Jan 23 00:00–03:00, 18:00–22:00 Jan 24 02:00–03:00, 18:00–24:00 Jan 25 00:00–03:00, 18:00–24:00 Jan 26 00:00–03:00, 18:00–24:00 Jan 27 00:00–01:00
February
Feb 4 18:00–24:00 Feb 5 00:00–03:00, 18:00–24:00 Feb 6 00:00–03:00, 18:00–24:00 Feb 7 00:00–03:00, 18:00–24:00 Feb 8 00:00–03:00, 18:00–24:00 Feb 9 00:00–03:00, 18:00–24:00 Feb 10 00:00–02:00, 18:00–24:00 Feb 11 00:00–03:00, 18:00–24:00 Feb 12 00:00–03:00 Feb 14 18:00–24:00 Feb 15 00:00–02:00, 18:00–24:00 Feb 16 18:00–24:00 Feb 17 00:00–02:00, 18:00–24:00 Feb 18 00:00–02:00, 18:00–24:00 Feb 19 00:00–02:00 Feb 20 00:00–07:00, 18:00–24:00 Feb 21 00:00–03:00, 18:00–24:00 Feb 22 00:00–01:00, 18:00–24:00 Feb 23 00:00–02:00, 19:00–24:00 Feb 24 00:00–02:00, 18:00–24:00 Feb 25 00:00–03:00, 18:00–24:00 Feb 26 00:00–03:00, 18:00–24:00 Feb 27 00:00–03:00, 18:00–24:00 Feb 28 00:00–03:00, 18:00–24:00
March
Mar 1 00:00–03:00 Mar 2 18:00–24:00 Mar 3 00:00–03:00 Mar 4 18:00–24:00 Mar 5 00:00–02:00, 19:00–24:00 Mar 6 00:00–02:00, 18:00–24:00 Mar 7 00:00–03:00, 19:00–24:00 Mar 8 00:00–03:00, 18:00–24:00 Mar 9 00:00–03:00, 19:00–24:00 Mar 10 00:00–03:00 Mar 11 18:00–24:00 Mar 12 00:00–03:00, 18:00–24:00 Mar 13 00:00–02:00, 19:00–24:00 Mar 14 00:00–03:00 Mar 15 19:00–24:00 Mar 16 00:00–03:00, 19:00–24:00 Mar 17 00:00–03:00, 19:00–24:00 Mar 18 00:00–03:00, 19:00–24:00 Mar 19 00:00–03:00, 19:00–24:00 Mar 20 00:00–03:00, 19:00–24:00 Mar 21 00:00–03:00, 19:00–24:00 Mar 22 00:00–03:00, 19:00–24:00 Mar 23 00:00–01:00, 19:00–24:00 Mar 24 00:00–03:00, 19:00–24:00 Mar 25 00:00–03:00, 19:00–24:00 Mar 26 00:00–04:00, 19:00–24:00 Mar 27 00:00–04:00, 19:00–24:00 Mar 28 00:00–03:00, 20:00–24:00 Mar 29 00:00–03:00, 20:00–24:00 Mar 30 00:00–03:00, 16:00–23:00
April
Apr 4 20:00–24:00 Apr 5 00:00–03:00, 20:00–24:00 Apr 6 00:00–02:00, 19:00–24:00 Apr 7 00:00–03:00, 19:00–24:00 Apr 8 00:00–02:00, 19:00–24:00 Apr 9 00:00–03:00, 21:00–24:00 Apr 10 00:00–03:00, 19:00–24:00 Apr 11 00:00–03:00, 19:00–24:00 Apr 12 00:00–03:00, 19:00–24:00 Apr 13 00:00–02:00, 19:00–24:00 Apr 14 00:00–03:00, 20:00–24:00 Apr 15 00:00–03:00, 19:00–24:00 Apr 16 00:00–02:00, 19:00–24:00 Apr 17 00:00–02:00, 19:00–24:00 Apr 18 00:00–02:00, 20:00–24:00 Apr 19 00:00–03:00, 19:00–23:00 Apr 20 00:00–01:00, 18:00–24:00 Apr 21 19:00–24:00 Apr 22 00:00–02:00, 18:00–24:00 Apr 23 00:00–01:00, 20:00–24:00 Apr 24 00:00–02:00, 19:00–24:00 Apr 25 00:00–02:00, 19:00–24:00 Apr 26 00:00–03:00, 20:00–24:00 Apr 27 00:00–02:00, 19:00–24:00 Apr 28 00:00–01:00, 19:00–24:00 Apr 29 00:00–01:00, 18:00–24:00 Apr 30 00:00–01:00
May
May 4 19:00–24:00 May 5 00:00–02:00, 19:00–24:00 May 6 00:00–02:00, 18:00–24:00 May 7 19:00–24:00 May 8 00:00–02:00, 16:00–22:00 May 9 19:00–24:00 May 10 00:00–01:00, 19:00–24:00 May 11 00:00–01:00, 19:00–24:00 May 12 00:00–01:00, 19:00–24:00 May 13 00:00–01:00, 18:00–24:00 May 14 19:00–24:00 May 15 00:00–01:00, 19:00–24:00 May 16 00:00–02:00, 19:00–24:00 May 17 00:00–02:00, 19:00–24:00 May 18 00:00–02:00, 19:00–24:00 May 19 00:00–02:00, 19:00–24:00 May 20 00:00–02:00, 20:00–24:00 May 21 00:00–03:00, 19:00–24:00 May 22 00:00–02:00, 20:00–24:00 May 23 00:00–02:00, 19:00–24:00 May 24 00:00–02:00, 19:00–24:00 May 25 00:00–02:00, 19:00–24:00 May 26 00:00–02:00, 20:00–24:00 May 27 00:00–03:00, 17:00–18:00 May 28 19:00–24:00 May 29 00:00–02:00, 19:00–24:00 May 30 00:00–02:00, 21:00–24:00 May 31 00:00–03:00
June
Jun 4 19:00–24:00 Jun 5 00:00–02:00, 19:00–24:00 Jun 6 00:00–02:00, 19:00–24:00 Jun 7 00:00–02:00, 19:00–24:00 Jun 8 00:00–02:00, 19:00–24:00 Jun 9 00:00–02:00, 19:00–24:00 Jun 10 00:00–02:00, 19:00–24:00 Jun 11 00:00–02:00, 19:00–24:00 Jun 12 00:00–02:00, 22:00–24:00 Jun 13 00:00–01:00, 20:00–24:00 Jun 14 00:00–02:00, 19:00–24:00 Jun 15 00:00–02:00, 20:00–24:00 Jun 16 00:00–02:00, 20:00–24:00 Jun 17 00:00–03:00, 19:00–24:00 Jun 18 00:00–02:00, 19:00–24:00 Jun 19 00:00–03:00, 20:00–24:00 Jun 20 00:00–02:00, 19:00–24:00 Jun 21 00:00–02:00, 21:00–24:00 Jun 22 00:00–03:00, 16:00–22:00 Jun 23 20:00–24:00 Jun 24 00:00–02:00, 20:00–24:00 Jun 25 00:00–02:00, 19:00–24:00 Jun 26 00:00–02:00, 16:00–22:00 Jun 27 16:00–23:00 Jun 28 17:00–23:00 Jun 29 17:00–23:00
July
Jul 4 16:00–22:00 Jul 5 18:00–24:00 Jul 6 17:00–23:00 Jul 7 18:00–24:00 Jul 8 18:00–24:00 Jul 11 19:00–21:00 Jul 12 19:00–24:00 Jul 13 00:00–02:00, 19:00–24:00 Jul 14 00:00–01:00, 18:00–24:00 Jul 15 00:00–01:00, 18:00–24:00 Jul 16 00:00–01:00, 18:00–24:00 Jul 17 00:00–01:00 Jul 18 12:00–19:00 Jul 19 17:00–24:00 Jul 20 00:00–01:00, 17:00–24:00 Jul 21 16:00–23:00 Jul 22 17:00–24:00 Jul 23 00:00–01:00, 17:00–24:00 Jul 24 16:00–23:00 Jul 25 16:00–23:00 Jul 26 16:00–22:00 Jul 27 16:00–23:00 Jul 28 18:00–24:00 Jul 29 00:00–01:00, 17:00–23:00 Jul 30 16:00–23:00
August
Aug 3 16:00–23:00 Aug 4 18:00–24:00 Aug 5 00:00–01:00, 18:00–24:00 Aug 6 00:00–01:00, 18:00–24:00 Aug 7 00:00–01:00, 19:00–24:00 Aug 8 00:00–01:00, 19:00–24:00 Aug 9 00:00–02:00, 19:00–24:00 Aug 10 00:00–01:00, 19:00–24:00 Aug 11 00:00–02:00, 20:00–24:00 Aug 12 00:00–02:00, 21:00–24:00 Aug 13 00:00–02:00, 20:00–24:00 Aug 14 00:00–02:00, 20:00–24:00 Aug 15 00:00–02:00, 20:00–24:00 Aug 16 00:00–03:00, 21:00–24:00 Aug 17 00:00–02:00, 20:00–24:00 Aug 18 00:00–02:00 Aug 19 10:00–17:00 Aug 20 11:00–17:00 Aug 21 11:00–17:00 Aug 22 11:00–12:00, 14:00–17:00 Aug 23 11:00–17:00 Aug 24 11:00–18:00 Aug 25 23:00–24:00 Aug 26 00:00–05:00 Aug 27 07:00–13:00 Aug 28 14:00–20:00 Aug 29 15:00–21:00 Aug 30 17:00–24:00 Aug 31 00:00–05:00
September
Sep 4 20:00–24:00 Sep 5 00:00–03:00, 20:00–24:00 Sep 6 00:00–03:00, 22:00–24:00 Sep 7 00:00–04:00 Sep 8 14:00–21:00 Sep 9 21:00–24:00 Sep 10 00:00–03:00 Sep 11 00:00–06:00 Sep 12 10:00–18:00 Sep 13 18:00–24:00 Sep 14 00:00–01:00, 20:00–24:00 Sep 15 00:00–04:00, 21:00–24:00 Sep 16 00:00–03:00, 19:00–24:00 Sep 17 00:00–02:00, 21:00–24:00 Sep 18 00:00–03:00, 20:00–24:00 Sep 19 00:00–03:00, 21:00–24:00 Sep 20 00:00–03:00, 21:00–22:00 Sep 21 21:00–24:00 Sep 22 00:00–05:00, 22:00–24:00 Sep 23 00:00–04:00 Sep 24 01:00–07:00 Sep 25 10:00–17:00 Sep 26 13:00–18:00 Sep 27 18:00–24:00 Sep 28 21:00–24:00 Sep 29 00:00–03:00, 23:00–24:00 Sep 30 00:00–05:00
October
Oct 1 11:00–17:00 Oct 5 10:00–12:00, 14:00–15:00 Oct 7 07:00–13:00 Oct 8 01:00–08:00 Oct 9 01:00–08:00 Oct 10 01:00–08:00 Oct 11 01:00–08:00 Oct 12 01:00–08:00 Oct 13 01:00–07:00 Oct 14 01:00–07:00 Oct 15 01:00–07:00 Oct 16 01:00–07:00 Oct 17 01:00–07:00 Oct 18 00:00–06:00 Oct 20 01:00–08:00 Oct 21 01:00–08:00 Oct 22 01:00–08:00 Oct 23 01:00–07:00 Oct 24 01:00–03:00, 11:00–16:00 Oct 25 12:00–17:00 Oct 26 09:00–16:00 Oct 27 07:00–14:00 Oct 28 10:00–16:00 Oct 29 02:00–06:00 Oct 30 01:00–07:00 Oct 31 01:00–08:00
November
Nov 4 01:00–08:00 Nov 5 01:00–07:00 Nov 6 02:00–08:00 Nov 8 01:00–07:00 Nov 9 02:00–09:00 Nov 10 02:00–08:00 Nov 11 05:00–11:00 Nov 12 00:00–07:00 Nov 13 01:00–07:00 Nov 15 01:00–02:00 Nov 16 02:00–08:00 Nov 17 02:00–08:00 Nov 18 00:00–07:00 Nov 19 01:00–08:00 Nov 20 03:00–09:00 Nov 21 04:00–10:00 Nov 22 02:00–09:00 Nov 23 04:00–09:00, 23:00–24:00 Nov 24 00:00–07:00, 23:00–24:00 Nov 25 00:00–07:00, 23:00–24:00 Nov 26 00:00–08:00, 23:00–24:00 Nov 27 00:00–07:00, 23:00–24:00 Nov 28 00:00–07:00, 23:00–24:00 Nov 29 00:00–08:00, 23:00–24:00 Nov 30 00:00–05:00
December
Dec 2 23:00–24:00 Dec 3 00:00–05:00 Dec 4 23:00–24:00 Dec 5 00:00–05:00 Dec 7 01:00–07:00, 23:00–24:00 Dec 8 00:00–06:00, 23:00–24:00 Dec 9 00:00–06:00 Dec 10 01:00–07:00 Dec 11 00:00–06:00, 23:00–24:00 Dec 12 00:00–06:00, 23:00–24:00 Dec 13 00:00–05:00 Dec 14 00:00–06:00 Dec 15 00:00–06:00 Dec 16 00:00–06:00 Dec 17 00:00–05:00 Dec 18 00:00–06:00 Dec 19 00:00–06:00 Dec 20 00:00–06:00 Dec 21 00:00–06:00 Dec 22 00:00–06:00 Dec 23 00:00–06:00 Dec 24 00:00–06:00 Dec 25 00:00–06:00 Dec 26 00:00–06:00 Dec 27 00:00–08:00 Dec 29 00:00–08:00 Dec 30 00:00–08:00 Dec 31 00:00–06:00