Most often in March, 30 days.
Highest follower count seen that year: 8,026.
January
Jan 8 22:00–24:00 Jan 9 00:00–02:00, 21:00–24:00 Jan 10 00:00–01:00, 21:00–24:00 Jan 11 00:00–01:00, 20:00–24:00 Jan 12 00:00–01:00 Jan 14 21:00–24:00 Jan 15 00:00–01:00, 21:00–24:00 Jan 16 00:00–01:00 Jan 17 21:00–24:00 Jan 18 00:00–01:00, 20:00–24:00 Jan 19 00:00–01:00 Jan 20 20:00–24:00 Jan 21 00:00–02:00, 21:00–24:00 Jan 23 21:00–22:00 Jan 24 21:00–24:00 Jan 25 21:00–24:00 Jan 26 00:00–01:00 Jan 27 21:00–24:00 Jan 28 00:00–01:00 Jan 29 20:00–24:00 Jan 30 00:00–02:00 Jan 31 20:00–24:00
February
Feb 1 00:00–01:00, 21:00–24:00 Feb 2 00:00–01:00 Feb 3 20:00–24:00 Feb 4 14:00–19:00 Feb 5 14:00–20:00 Feb 6 20:00–24:00 Feb 7 00:00–01:00 Feb 10 20:00–24:00 Feb 11 00:00–01:00, 20:00–24:00 Feb 12 00:00–01:00, 20:00–24:00 Feb 13 00:00–02:00, 21:00–24:00 Feb 14 20:00–24:00 Feb 15 00:00–01:00 Feb 17 21:00–24:00 Feb 18 00:00–02:00, 20:00–24:00 Feb 19 00:00–01:00, 21:00–24:00 Feb 20 00:00–01:00, 20:00–24:00 Feb 21 21:00–24:00 Feb 22 00:00–02:00, 20:00–24:00 Feb 23 00:00–01:00 Feb 24 21:00–24:00 Feb 25 00:00–01:00 Feb 26 22:00–24:00 Feb 27 00:00–01:00, 20:00–24:00 Feb 28 00:00–01:00, 20:00–24:00
March
Mar 1 00:00–02:00, 21:00–24:00 Mar 2 00:00–02:00 Mar 3 20:00–24:00 Mar 4 00:00–02:00, 20:00–24:00 Mar 5 00:00–01:00 Mar 6 20:00–24:00 Mar 7 00:00–01:00, 20:00–24:00 Mar 8 00:00–02:00, 15:00–21:00 Mar 10 14:00–23:00 Mar 11 14:00–20:00 Mar 12 19:00–24:00 Mar 13 02:00–03:00, 20:00–24:00 Mar 14 00:00–01:00, 21:00–24:00 Mar 15 00:00–02:00, 20:00–24:00 Mar 16 00:00–02:00 Mar 17 19:00–24:00 Mar 18 00:00–01:00 Mar 19 20:00–24:00 Mar 20 00:00–01:00, 20:00–24:00 Mar 21 00:00–01:00, 20:00–24:00 Mar 22 00:00–01:00, 22:00–23:00 Mar 23 00:00–01:00 Mar 24 20:00–24:00 Mar 25 00:00–01:00, 20:00–24:00 Mar 26 00:00–01:00, 20:00–24:00 Mar 27 00:00–01:00, 20:00–24:00 Mar 28 00:00–01:00 Mar 29 20:00–24:00 Mar 30 00:00–01:00 Mar 31 21:00–24:00
April
Apr 1 00:00–02:00, 20:00–24:00 Apr 2 00:00–02:00, 19:00–24:00 Apr 3 00:00–01:00, 19:00–24:00 Apr 4 20:00–24:00 Apr 5 00:00–01:00, 22:00–24:00 Apr 6 00:00–02:00 Apr 7 22:00–24:00 Apr 8 00:00–02:00, 20:00–24:00 Apr 9 00:00–01:00, 16:00–18:00, 21:00–23:00 Apr 10 15:00–21:00 Apr 11 15:00–22:00 Apr 12 20:00–24:00 Apr 13 00:00–01:00 Apr 14 19:00–24:00 Apr 15 00:00–01:00, 21:00–24:00 Apr 16 00:00–01:00 Apr 21 21:00–24:00 Apr 22 00:00–01:00, 20:00–24:00 Apr 23 00:00–01:00, 21:00–23:00 Apr 25 20:00–24:00 Apr 26 00:00–01:00, 21:00–24:00 Apr 27 00:00–01:00, 21:00–24:00 Apr 28 00:00–01:00, 20:00–24:00 Apr 29 00:00–01:00, 15:00–24:00 Apr 30 20:00–24:00
May
May 1 00:00–01:00, 20:00–24:00 May 2 00:00–01:00, 18:00–24:00 May 3 15:00–19:00 May 5 16:00–21:00 May 6 14:00–19:00 May 7 14:00–21:00 May 8 14:00–20:00 May 9 14:00–20:00 May 12 15:00–21:00 May 13 15:00–21:00 May 14 14:00–19:00 May 15 15:00–20:00 May 16 14:00–20:00 May 17 16:00–20:00 May 19 17:00–21:00 May 21 15:00–21:00 May 23 14:00–20:00 May 24 15:00–19:00 May 26 15:00–20:00 May 27 14:00–20:00 May 28 15:00–20:00 May 29 14:00–20:00 May 30 15:00–20:00 May 31 14:00–19:00
June
Jun 2 16:00–20:00 Jun 3 14:00–21:00 Jun 4 14:00–19:00 Jun 5 15:00–19:00 Jun 6 15:00–19:00 Jun 7 14:00–20:00 Jun 9 14:00–19:00 Jun 10 14:00–19:00 Jun 11 16:00–18:00 Jun 13 14:00–20:00 Jun 14 15:00–20:00 Jun 16 14:00–19:00 Jun 17 14:00–20:00 Jun 18 14:00–19:00 Jun 19 14:00–20:00 Jun 20 14:00–20:00 Jun 21 15:00–20:00 Jun 23 15:00–20:00 Jun 24 15:00–20:00 Jun 25 14:00–20:00 Jun 26 15:00–20:00 Jun 27 15:00–19:00 Jun 28 15:00–19:00 Jun 29 20:00–24:00 Jun 30 15:00–20:00
July
Jul 2 19:00–24:00 Jul 3 00:00–01:00, 14:00–19:00 Jul 4 15:00–19:00 Jul 5 15:00–20:00 Jul 7 14:00–19:00 Jul 8 14:00–20:00 Jul 9 14:00–20:00 Jul 10 15:00–19:00 Jul 11 14:00–20:00 Jul 12 15:00–19:00 Jul 14 14:00–20:00 Jul 15 14:00–20:00 Jul 16 14:00–19:00 Jul 18 14:00–21:00 Jul 19 15:00–20:00 Jul 21 15:00–20:00 Jul 22 14:00–19:00 Jul 23 15:00–20:00 Jul 24 15:00–20:00 Jul 25 15:00–19:00 Jul 26 14:00–20:00 Jul 28 15:00–20:00 Jul 29 15:00–20:00 Jul 30 14:00–17:00
August
Aug 1 14:00–19:00 Aug 2 15:00–19:00 Aug 4 15:00–20:00 Aug 5 16:00–19:00 Aug 6 15:00–19:00 Aug 8 15:00–20:00 Aug 9 14:00–20:00 Aug 11 15:00–19:00 Aug 12 14:00–20:00 Aug 13 14:00–19:00 Aug 14 15:00–19:00 Aug 15 14:00–19:00 Aug 16 15:00–19:00 Aug 18 15:00–20:00 Aug 19 14:00–19:00 Aug 20 14:00–19:00 Aug 21 15:00–20:00 Aug 22 14:00–19:00 Aug 23 14:00–20:00 Aug 26 15:00–20:00 Aug 27 15:00–20:00 Aug 28 15:00–20:00 Aug 29 15:00–20:00 Aug 30 15:00–20:00 Aug 31 20:00–24:00
September
Sep 1 15:00–20:00 Sep 3 15:00–19:00 Sep 4 15:00–20:00 Sep 5 15:00–19:00 Sep 6 15:00–21:00 Sep 8 15:00–20:00 Sep 9 17:00–20:00 Sep 10 16:00–21:00 Sep 11 15:00–21:00 Sep 12 15:00–18:00 Sep 13 15:00–21:00 Sep 14 21:00–24:00 Sep 15 00:00–01:00, 15:00–20:00 Sep 17 15:00–20:00 Sep 18 15:00–20:00 Sep 20 15:00–20:00 Sep 22 15:00–19:00 Sep 23 15:00–20:00 Sep 24 15:00–19:00 Sep 25 15:00–19:00 Sep 26 16:00–20:00 Sep 27 15:00–20:00 Sep 29 15:00–20:00 Sep 30 15:00–21:00
October
Oct 1 16:00–20:00 Oct 2 14:00–19:00 Oct 3 14:00–20:00 Oct 4 15:00–20:00 Oct 6 15:00–21:00 Oct 7 15:00–18:00 Oct 8 15:00–19:00 Oct 9 15:00–20:00 Oct 10 15:00–20:00 Oct 11 14:00–20:00 Oct 13 14:00–19:00 Oct 15 15:00–19:00 Oct 16 15:00–19:00 Oct 17 15:00–19:00 Oct 18 14:00–20:00 Oct 20 15:00–20:00 Oct 21 14:00–19:00 Oct 22 15:00–19:00 Oct 23 15:00–19:00 Oct 24 14:00–19:00 Oct 25 15:00–20:00 Oct 27 15:00–19:00 Oct 28 16:00–20:00 Oct 29 15:00–20:00 Oct 30 15:00–20:00 Oct 31 15:00–20:00
November
Nov 3 15:00–19:00 Nov 4 14:00–19:00 Nov 5 14:00–19:00 Nov 6 15:00–19:00 Nov 7 15:00–19:00 Nov 8 15:00–19:00 Nov 10 15:00–19:00 Nov 11 14:00–16:00 Nov 12 14:00–20:00 Nov 13 15:00–20:00 Nov 14 15:00–20:00 Nov 15 15:00–20:00 Nov 17 15:00–20:00 Nov 18 15:00–19:00 Nov 19 15:00–20:00 Nov 20 15:00–20:00 Nov 21 15:00–19:00 Nov 22 15:00–18:00 Nov 24 15:00–19:00 Nov 25 15:00–19:00 Nov 26 15:00–20:00 Nov 27 15:00–20:00 Nov 28 15:00–20:00 Nov 29 15:00–20:00
December
Dec 1 16:00–20:00 Dec 3 15:00–20:00 Dec 4 15:00–20:00 Dec 5 15:00–21:00 Dec 6 15:00–19:00 Dec 9 15:00–20:00 Dec 10 14:00–19:00 Dec 11 15:00–21:00 Dec 12 21:00–24:00 Dec 13 00:00–01:00, 15:00–21:00 Dec 15 15:00–20:00 Dec 16 20:00–24:00 Dec 17 00:00–01:00, 15:00–20:00 Dec 19 15:00–19:00 Dec 20 15:00–20:00 Dec 22 15:00–20:00 Dec 23 15:00–20:00 Dec 24 14:00–16:00 Dec 26 15:00–20:00 Dec 27 15:00–19:00 Dec 29 15:00–19:00 Dec 30 15:00–18:00 Dec 31 15:00–18:00