Most often in May, 28 days.
Highest follower count seen that year: 2,858.
January
Jan 1 12:00–14:00 Jan 14 17:00–18:00 Jan 15 14:00–18:00 Jan 16 15:00–18:00 Jan 17 17:00–18:00 Jan 24 15:00–18:00 Jan 25 15:00–17:00 Jan 26 14:00–17:00 Jan 27 15:00–18:00 Jan 28 14:00–18:00 Jan 29 16:00–17:00 Jan 30 15:00–17:00 Jan 31 15:00–17:00
February
Feb 2 15:00–18:00 Feb 3 04:00–08:00, 15:00–18:00 Feb 4 14:00–17:00 Feb 5 14:00–17:00 Feb 6 13:00–17:00 Feb 7 04:00–06:00, 15:00–17:00 Feb 8 16:00–18:00 Feb 9 09:00–11:00 Feb 10 16:00–19:00 Feb 11 04:00–06:00, 15:00–18:00 Feb 12 12:00–17:00 Feb 13 04:00–07:00, 15:00–18:00 Feb 14 04:00–07:00, 14:00–18:00 Feb 15 13:00–17:00 Feb 16 14:00–16:00 Feb 17 16:00–18:00 Feb 18 04:00–06:00, 15:00–18:00 Feb 19 14:00–18:00 Feb 20 15:00–18:00 Feb 21 06:00–07:00, 14:00–17:00 Feb 23 13:00–17:00 Feb 24 17:00–18:00 Feb 25 14:00–17:00 Feb 26 05:00–06:00, 16:00–18:00 Feb 27 15:00–18:00 Feb 28 14:00–16:00
March
Mar 4 13:00–16:00 Mar 5 14:00–17:00 Mar 6 13:00–17:00 Mar 7 04:00–06:00, 16:00–18:00 Mar 8 02:00–03:00, 15:00–17:00 Mar 10 15:00–17:00 Mar 11 13:00–16:00 Mar 12 05:00–06:00, 14:00–17:00 Mar 13 16:00–17:00 Mar 14 16:00–19:00 Mar 15 15:00–17:00 Mar 16 03:00–05:00 Mar 18 15:00–17:00 Mar 20 16:00–17:00 Mar 21 14:00–17:00 Mar 23 20:00–22:00 Mar 25 14:00–17:00 Mar 26 15:00–17:00 Mar 27 15:00–18:00 Mar 28 15:00–18:00 Mar 29 15:00–16:00 Mar 30 15:00–17:00
April
Apr 1 13:00–17:00 Apr 2 05:00–07:00, 15:00–17:00 Apr 3 16:00–17:00 Apr 4 04:00–07:00, 15:00–17:00 Apr 5 05:00–07:00 Apr 8 15:00–17:00 Apr 9 14:00–15:00 Apr 10 05:00–06:00, 15:00–16:00 Apr 11 16:00–17:00 Apr 21 16:00–17:00 Apr 22 04:00–06:00, 14:00–17:00 Apr 23 04:00–06:00, 15:00–17:00 Apr 24 04:00–07:00, 16:00–17:00 Apr 25 04:00–07:00, 15:00–18:00 Apr 26 05:00–07:00, 15:00–16:00 Apr 27 15:00–17:00 Apr 29 17:00–18:00 Apr 30 06:00–07:00, 16:00–18:00
May
May 1 03:00–07:00, 15:00–18:00 May 2 04:00–06:00, 15:00–17:00 May 3 14:00–16:00 May 5 22:00–24:00 May 6 00:00–01:00, 15:00–18:00 May 7 04:00–06:00, 15:00–17:00 May 8 04:00–06:00, 15:00–17:00 May 9 14:00–18:00 May 11 15:00–16:00 May 12 16:00–18:00 May 13 15:00–17:00 May 14 14:00–17:00 May 15 05:00–06:00, 14:00–16:00 May 16 15:00–18:00 May 17 04:00–07:00, 16:00–17:00 May 18 11:00–14:00 May 19 16:00–18:00 May 20 03:00–04:00, 14:00–17:00 May 21 04:00–05:00, 16:00–18:00 May 22 16:00–18:00 May 23 15:00–17:00 May 24 04:00–05:00, 15:00–16:00 May 26 15:00–17:00 May 27 04:00–06:00, 15:00–18:00 May 28 04:00–06:00, 15:00–17:00 May 29 04:00–05:00, 15:00–17:00 May 30 14:00–17:00 May 31 15:00–16:00
June
Jun 1 13:00–16:00 Jun 3 16:00–18:00 Jun 4 15:00–18:00 Jun 5 04:00–06:00, 12:00–17:00 Jun 6 14:00–17:00 Jun 7 04:00–05:00, 14:00–17:00 Jun 9 16:00–18:00 Jun 10 14:00–18:00 Jun 11 15:00–17:00 Jun 12 15:00–18:00 Jun 13 04:00–07:00, 13:00–18:00 Jun 14 16:00–17:00 Jun 15 14:00–16:00 Jun 16 16:00–19:00 Jun 17 16:00–19:00 Jun 18 15:00–18:00 Jun 19 04:00–06:00, 16:00–18:00 Jun 20 14:00–16:00 Jun 21 15:00–16:00 Jun 22 16:00–18:00 Jun 23 15:00–18:00 Jun 25 04:00–08:00 Jun 26 04:00–05:00 Jun 27 04:00–06:00, 16:00–17:00 Jun 28 16:00–17:00 Jun 29 04:00–05:00, 14:00–17:00
July
Jul 2 03:00–06:00, 15:00–17:00 Jul 3 04:00–06:00, 17:00–18:00 Jul 4 03:00–05:00, 15:00–17:00 Jul 5 03:00–07:00, 16:00–18:00 Jul 7 16:00–18:00 Jul 8 03:00–05:00, 16:00–18:00 Jul 9 03:00–07:00, 17:00–18:00 Jul 10 03:00–06:00, 16:00–18:00 Jul 11 04:00–06:00, 16:00–17:00 Jul 12 04:00–06:00, 16:00–18:00 Jul 13 15:00–17:00 Jul 15 03:00–06:00, 16:00–18:00 Jul 16 04:00–06:00, 15:00–19:00 Jul 17 16:00–18:00 Jul 18 03:00–06:00, 14:00–18:00 Jul 19 15:00–18:00 Jul 20 16:00–19:00 Jul 21 16:00–17:00 Jul 22 14:00–18:00 Jul 23 03:00–06:00, 12:00–16:00 Jul 24 14:00–17:00 Jul 25 04:00–06:00, 18:00–20:00 Jul 26 14:00–15:00 Jul 27 14:00–17:00 Jul 28 04:00–06:00 Jul 29 04:00–05:00, 15:00–17:00 Jul 30 04:00–06:00
August
Aug 1 16:00–18:00 Aug 2 14:00–17:00 Aug 3 14:00–15:00 Aug 5 15:00–18:00 Aug 6 20:00–21:00 Aug 7 16:00–18:00 Aug 8 16:00–19:00 Aug 9 15:00–18:00 Aug 10 15:00–17:00 Aug 11 15:00–18:00 Aug 12 16:00–19:00 Aug 13 03:00–06:00, 16:00–18:00 Aug 14 03:00–06:00, 15:00–18:00 Aug 15 18:00–21:00 Aug 16 04:00–05:00 Aug 18 16:00–19:00 Aug 19 15:00–18:00 Aug 20 15:00–18:00 Aug 21 04:00–05:00, 16:00–19:00 Aug 22 03:00–06:00, 14:00–17:00 Aug 25 17:00–19:00 Aug 26 04:00–05:00, 16:00–18:00 Aug 27 03:00–05:00, 16:00–18:00 Aug 28 14:00–18:00 Aug 29 17:00–21:00 Aug 30 16:00–18:00 Aug 31 15:00–18:00
September
Sep 1 13:00–17:00 Sep 2 15:00–17:00 Sep 3 04:00–05:00, 16:00–18:00 Sep 4 15:00–18:00 Sep 5 14:00–17:00 Sep 6 16:00–17:00 Sep 8 13:00–16:00 Sep 9 04:00–06:00, 14:00–18:00 Sep 10 15:00–16:00 Sep 12 14:00–17:00 Sep 13 05:00–06:00, 15:00–18:00 Sep 14 16:00–18:00, 22:00–24:00 Sep 15 15:00–16:00 Sep 16 17:00–18:00 Sep 17 03:00–05:00, 15:00–17:00 Sep 19 03:00–05:00, 15:00–16:00 Sep 21 14:00–16:00 Sep 22 12:00–16:00 Sep 24 15:00–17:00 Sep 25 13:00–15:00 Sep 26 16:00–17:00 Sep 27 12:00–17:00 Sep 28 12:00–15:00 Sep 30 04:00–05:00
October
Oct 5 15:00–17:00 Oct 6 13:00–16:00 Oct 7 15:00–17:00 Oct 8 12:00–17:00 Oct 9 14:00–16:00 Oct 10 14:00–16:00 Oct 11 15:00–17:00 Oct 14 16:00–18:00 Oct 15 15:00–17:00 Oct 16 16:00–18:00 Oct 17 15:00–17:00 Oct 19 14:00–16:00 Oct 20 14:00–17:00 Oct 22 03:00–07:00, 16:00–18:00 Oct 23 16:00–17:00 Oct 24 04:00–06:00, 14:00–17:00 Oct 29 14:00–17:00 Oct 30 15:00–16:00
November
Nov 2 16:00–18:00 Nov 4 15:00–17:00 Nov 6 14:00–16:00 Nov 7 15:00–17:00 Nov 9 15:00–18:00 Nov 10 15:00–18:00 Nov 11 03:00–06:00, 14:00–17:00 Nov 12 04:00–06:00, 14:00–17:00 Nov 13 02:00–05:00, 15:00–18:00 Nov 14 15:00–16:00, 18:00–20:00 Nov 15 04:00–06:00, 15:00–18:00 Nov 16 18:00–21:00 Nov 17 14:00–17:00 Nov 18 13:00–17:00 Nov 19 16:00–19:00 Nov 20 13:00–15:00, 17:00–19:00 Nov 21 04:00–06:00, 14:00–17:00 Nov 22 04:00–06:00, 14:00–18:00 Nov 23 13:00–15:00 Nov 24 01:00–03:00 Nov 25 04:00–06:00, 14:00–17:00 Nov 26 03:00–06:00, 14:00–17:00 Nov 27 04:00–06:00, 16:00–17:00 Nov 28 03:00–07:00, 17:00–19:00 Nov 30 03:00–05:00, 17:00–21:00
December
Dec 1 16:00–19:00 Dec 2 03:00–07:00, 16:00–18:00 Dec 3 04:00–06:00, 15:00–18:00 Dec 4 04:00–06:00, 14:00–15:00 Dec 10 17:00–19:00 Dec 12 03:00–05:00, 15:00–18:00 Dec 13 04:00–05:00, 16:00–19:00 Dec 14 04:00–06:00, 16:00–18:00, 22:00–24:00 Dec 15 04:00–07:00, 17:00–20:00 Dec 16 02:00–06:00, 16:00–20:00 Dec 17 00:00–01:00, 03:00–06:00, 17:00–18:00, 20:00–24:00 Dec 18 03:00–06:00, 14:00–18:00 Dec 19 04:00–06:00, 16:00–18:00 Dec 20 03:00–06:00, 16:00–18:00 Dec 21 01:00–05:00, 12:00–16:00 Dec 22 13:00–17:00 Dec 23 03:00–06:00, 15:00–17:00 Dec 24 04:00–07:00, 14:00–18:00 Dec 26 00:00–05:00, 14:00–18:00 Dec 27 04:00–06:00, 15:00–18:00 Dec 28 13:00–17:00 Dec 29 12:00–15:00 Dec 30 04:00–06:00, 14:00–16:00 Dec 31 16:00–21:00