Most often in March, 29 days.
Highest follower count seen that year: 13,873.
February
Feb 27 06:00–14:00
March
Mar 1 05:00–14:00 Mar 2 07:00–14:00 Mar 3 05:00–14:00 Mar 4 05:00–14:00 Mar 5 06:00–14:00 Mar 6 05:00–13:00 Mar 7 11:00–18:00 Mar 8 11:00–18:00 Mar 9 11:00–18:00 Mar 10 05:00–13:00 Mar 11 06:00–13:00 Mar 12 05:00–13:00 Mar 13 05:00–13:00 Mar 14 05:00–13:00 Mar 15 05:00–13:00 Mar 16 06:00–13:00 Mar 17 05:00–13:00 Mar 19 05:00–13:00 Mar 20 05:00–12:00 Mar 21 10:00–13:00 Mar 22 06:00–13:00 Mar 23 05:00–13:00 Mar 24 05:00–12:00 Mar 26 05:00–13:00 Mar 27 05:00–12:00 Mar 28 05:00–13:00 Mar 29 05:00–12:00 Mar 30 08:00–13:00 Mar 31 06:00–13:00
April
Apr 2 05:00–12:00 Apr 3 04:00–12:00 Apr 4 04:00–11:00 Apr 5 10:00–16:00 Apr 6 11:00–15:00 Apr 7 04:00–05:00, 09:00–11:00 Apr 9 04:00–11:00 Apr 10 04:00–11:00 Apr 11 04:00–11:00 Apr 12 04:00–11:00 Apr 13 04:00–12:00 Apr 14 04:00–11:00 Apr 16 04:00–11:00 Apr 17 04:00–12:00 Apr 18 04:00–11:00 Apr 19 05:00–07:00 Apr 20 09:00–16:00 Apr 22 04:00–12:00 Apr 23 05:00–09:00 Apr 24 05:00–12:00 Apr 25 04:00–12:00 Apr 26 05:00–11:00 Apr 27 05:00–12:00 Apr 28 07:00–12:00 Apr 29 04:00–11:00 Apr 30 06:00–11:00
May
May 2 09:00–16:00 May 3 04:00–11:00 May 4 06:00–13:00 May 5 04:00–11:00 May 7 04:00–12:00 May 8 04:00–14:00 May 9 04:00–11:00 May 10 04:00–06:00, 08:00–11:00 May 11 04:00–12:00 May 12 05:00–12:00 May 14 08:00–10:00 May 15 08:00–10:00 May 16 08:00–15:00 May 17 04:00–12:00 May 18 09:00–16:00 May 21 06:00–11:00 May 22 05:00–06:00, 08:00–10:00 May 23 05:00–11:00 May 24 05:00–12:00 May 25 04:00–11:00 May 26 04:00–11:00 May 28 04:00–11:00 May 29 04:00–11:00 May 30 04:00–11:00 May 31 04:00–11:00
June
Jun 1 09:00–14:00 Jun 4 04:00–11:00 Jun 5 04:00–11:00 Jun 6 05:00–11:00 Jun 7 04:00–11:00 Jun 8 04:00–11:00 Jun 9 04:00–11:00 Jun 12 07:00–11:00 Jun 13 14:00–19:00 Jun 14 14:00–19:00 Jun 15 15:00–18:00 Jun 16 05:00–11:00 Jun 18 05:00–07:00, 09:00–11:00 Jun 19 05:00–11:00 Jun 20 04:00–11:00 Jun 21 04:00–11:00 Jun 22 04:00–11:00 Jun 23 04:00–11:00 Jun 25 04:00–11:00 Jun 26 04:00–11:00 Jun 27 08:00–15:00 Jun 28 05:00–11:00 Jun 29 04:00–11:00 Jun 30 04:00–11:00
July
Jul 2 04:00–11:00 Jul 3 04:00–11:00 Jul 4 04:00–11:00 Jul 5 04:00–11:00 Jul 6 04:00–12:00 Jul 7 04:00–11:00 Jul 9 04:00–11:00 Jul 10 04:00–11:00 Jul 11 05:00–11:00 Jul 12 12:00–17:00 Jul 14 05:00–11:00 Jul 15 04:00–11:00 Jul 16 05:00–12:00 Jul 17 04:00–11:00 Jul 18 04:00–11:00 Jul 20 12:00–18:00 Jul 21 05:00–12:00 Jul 22 04:00–11:00 Jul 23 04:00–12:00 Jul 24 04:00–11:00 Jul 25 05:00–12:00 Jul 26 04:00–11:00 Jul 27 04:00–11:00 Jul 28 04:00–11:00 Jul 30 04:00–11:00 Jul 31 04:00–11:00
August
Aug 1 04:00–12:00 Aug 3 14:00–18:00 Aug 4 05:00–11:00 Aug 5 06:00–11:00 Aug 8 07:00–17:00 Aug 10 05:00–13:00 Aug 11 05:00–10:00 Aug 12 04:00–11:00 Aug 13 05:00–12:00 Aug 14 04:00–11:00 Aug 15 05:00–11:00 Aug 17 05:00–12:00 Aug 18 05:00–12:00 Aug 19 04:00–12:00 Aug 20 04:00–12:00 Aug 21 04:00–12:00 Aug 22 04:00–12:00 Aug 23 07:00–12:00 Aug 25 05:00–12:00 Aug 26 06:00–13:00 Aug 27 04:00–12:00 Aug 28 05:00–12:00 Aug 29 05:00–12:00 Aug 30 05:00–12:00
September
Sep 1 04:00–12:00 Sep 2 04:00–12:00 Sep 3 04:00–11:00 Sep 4 04:00–12:00 Sep 5 10:00–15:00 Sep 7 05:00–12:00 Sep 8 04:00–12:00 Sep 9 04:00–12:00 Sep 10 05:00–13:00 Sep 11 10:00–18:00 Sep 12 04:00–12:00 Sep 15 05:00–12:00 Sep 16 04:00–07:00, 09:00–13:00 Sep 17 04:00–12:00 Sep 18 04:00–12:00 Sep 20 09:00–14:00 Sep 21 05:00–12:00 Sep 22 05:00–12:00 Sep 23 05:00–12:00 Sep 24 04:00–12:00 Sep 25 04:00–12:00 Sep 26 04:00–12:00 Sep 28 09:00–16:00 Sep 29 04:00–12:00 Sep 30 04:00–12:00
October
Oct 9 08:00–16:00 Oct 10 08:00–17:00 Oct 11 05:00–14:00 Oct 12 06:00–14:00 Oct 13 05:00–15:00 Oct 14 05:00–14:00 Oct 15 05:00–14:00 Oct 16 05:00–12:00 Oct 17 04:00–12:00 Oct 18 07:00–13:00 Oct 20 04:00–12:00 Oct 21 05:00–12:00 Oct 22 05:00–12:00 Oct 23 04:00–13:00 Oct 24 04:00–12:00 Oct 25 11:00–16:00 Oct 27 05:00–12:00 Oct 28 05:00–13:00 Oct 29 05:00–13:00 Oct 30 06:00–13:00 Oct 31 12:00–17:00
November
Nov 2 06:00–17:00 Nov 3 05:00–17:00 Nov 4 05:00–17:00 Nov 6 05:00–15:00 Nov 7 05:00–12:00 Nov 10 05:00–17:00 Nov 11 05:00–17:00 Nov 12 05:00–17:00 Nov 13 05:00–16:00 Nov 14 05:00–16:00 Nov 17 05:00–16:00 Nov 18 05:00–16:00 Nov 19 05:00–16:00 Nov 20 05:00–16:00 Nov 21 07:00–18:00 Nov 24 05:00–16:00 Nov 25 05:00–17:00 Nov 26 05:00–16:00 Nov 27 05:00–16:00 Nov 28 05:00–12:00
December
Dec 1 05:00–16:00 Dec 2 05:00–16:00 Dec 3 05:00–16:00 Dec 4 05:00–14:00 Dec 8 06:00–16:00 Dec 9 05:00–16:00 Dec 10 05:00–16:00 Dec 11 05:00–16:00 Dec 12 05:00–16:00 Dec 15 05:00–15:00 Dec 16 05:00–16:00 Dec 17 05:00–17:00 Dec 18 05:00–16:00 Dec 19 05:00–16:00 Dec 20 12:00–18:00 Dec 22 05:00–18:00 Dec 23 05:00–14:00