Most often in March, 23 days.
Highest follower count seen that year: 1,379.
February
Feb 4 02:00–03:00, 23:00–24:00 Feb 5 03:00–04:00, 23:00–24:00 Feb 6 08:00–09:00 Feb 7 13:00–14:00 Feb 8 02:00–03:00 Feb 9 14:00–15:00 Feb 10 02:00–03:00, 23:00–24:00 Feb 12 14:00–15:00, 23:00–24:00 Feb 14 02:00–03:00, 23:00–24:00 Feb 18 13:00–14:00, 21:00–22:00 Feb 20 06:00–07:00 Feb 21 00:00–01:00 Feb 22 00:00–01:00 Feb 24 00:00–01:00 Feb 26 23:00–24:00 Feb 27 04:00–05:00 Feb 28 03:00–04:00, 06:00–07:00
March
Mar 2 23:00–24:00 Mar 3 23:00–24:00 Mar 4 08:00–09:00 Mar 5 04:00–05:00 Mar 7 06:00–07:00 Mar 8 01:00–02:00, 20:00–21:00 Mar 9 23:00–24:00 Mar 10 07:00–09:00 Mar 11 14:00–15:00 Mar 12 03:00–04:00, 23:00–24:00 Mar 13 04:00–05:00, 08:00–09:00 Mar 14 03:00–05:00 Mar 17 13:00–14:00, 23:00–24:00 Mar 18 05:00–06:00, 23:00–24:00 Mar 19 03:00–05:00 Mar 21 00:00–01:00, 13:00–14:00 Mar 23 23:00–24:00 Mar 24 04:00–05:00, 13:00–14:00, 23:00–24:00 Mar 25 03:00–04:00, 08:00–09:00, 13:00–14:00, 21:00–22:00 Mar 26 13:00–14:00, 23:00–24:00 Mar 27 23:00–24:00 Mar 29 03:00–04:00, 06:00–07:00 Mar 31 23:00–24:00
April
Apr 1 23:00–24:00 Apr 2 03:00–05:00, 23:00–24:00 Apr 3 03:00–05:00 Apr 7 23:00–24:00 Apr 9 03:00–04:00 Apr 12 07:00–08:00 Apr 13 02:00–05:00, 23:00–24:00 Apr 16 01:00–02:00, 05:00–06:00 Apr 17 03:00–07:00, 20:00–21:00 Apr 18 11:00–12:00, 23:00–24:00 Apr 20 13:00–14:00 Apr 21 01:00–02:00, 04:00–05:00, 13:00–14:00, 20:00–21:00, 23:00–24:00 Apr 22 03:00–05:00 Apr 23 02:00–05:00 Apr 24 00:00–01:00, 08:00–09:00, 22:00–23:00 Apr 25 12:00–13:00 Apr 26 10:00–11:00 Apr 28 01:00–02:00 Apr 29 12:00–13:00 Apr 30 09:00–10:00
May
May 1 13:00–14:00, 22:00–23:00 May 2 02:00–04:00 May 5 23:00–24:00 May 8 13:00–14:00 May 9 02:00–04:00 May 12 03:00–04:00 May 13 11:00–12:00 May 14 02:00–03:00, 19:00–20:00 May 15 02:00–04:00 May 16 03:00–04:00 May 19 02:00–05:00, 08:00–09:00, 20:00–21:00 May 20 02:00–03:00 May 21 01:00–02:00 May 23 03:00–04:00, 19:00–20:00, 23:00–24:00 May 26 04:00–05:00 May 27 02:00–04:00 May 28 02:00–04:00, 20:00–21:00 May 29 04:00–05:00 May 30 03:00–05:00
June
Jun 1 12:00–14:00 Jun 2 01:00–02:00 Jun 4 02:00–03:00 Jun 5 04:00–05:00 Jun 9 03:00–04:00, 08:00–09:00 Jun 10 03:00–04:00 Jun 11 03:00–04:00 Jun 15 03:00–04:00 Jun 16 03:00–04:00 Jun 17 01:00–02:00 Jun 18 04:00–05:00 Jun 19 17:00–18:00 Jun 20 08:00–09:00 Jun 21 01:00–02:00 Jun 22 01:00–02:00, 12:00–13:00 Jun 23 02:00–04:00 Jun 24 04:00–05:00 Jun 25 02:00–03:00 Jun 26 02:00–03:00 Jun 27 04:00–05:00 Jun 30 03:00–04:00
July
Jul 2 03:00–05:00 Jul 3 02:00–03:00 Jul 4 02:00–03:00 Jul 6 13:00–14:00 Jul 9 03:00–04:00 Jul 10 02:00–03:00 Jul 11 01:00–04:00 Jul 14 01:00–03:00 Jul 15 03:00–04:00 Jul 16 04:00–05:00 Jul 21 03:00–04:00 Jul 22 04:00–05:00 Jul 23 03:00–04:00, 07:00–08:00 Jul 24 02:00–04:00 Jul 28 04:00–05:00 Jul 30 03:00–04:00, 07:00–08:00 Jul 31 08:00–09:00
August
Aug 2 03:00–04:00, 09:00–10:00 Aug 3 20:00–21:00 Aug 4 01:00–02:00 Aug 6 01:00–03:00 Aug 7 04:00–05:00 Aug 8 02:00–04:00 Aug 12 03:00–04:00 Aug 13 04:00–05:00 Aug 14 03:00–04:00 Aug 17 00:00–01:00 Aug 19 03:00–04:00 Aug 20 04:00–05:00, 08:00–09:00 Aug 21 02:00–05:00 Aug 22 03:00–04:00, 08:00–09:00 Aug 25 08:00–09:00 Aug 26 02:00–04:00 Aug 28 01:00–02:00 Aug 29 03:00–05:00 Aug 30 02:00–03:00
September
Sep 1 06:00–08:00 Sep 2 04:00–05:00 Sep 4 01:00–03:00 Sep 5 00:00–01:00, 04:00–05:00 Sep 8 02:00–04:00 Sep 9 04:00–05:00 Sep 10 01:00–03:00 Sep 12 03:00–04:00 Sep 16 04:00–05:00 Sep 17 03:00–04:00 Sep 19 01:00–02:00 Sep 22 07:00–08:00 Sep 23 08:00–09:00 Sep 24 02:00–03:00 Sep 25 03:00–04:00 Sep 26 04:00–05:00 Sep 29 02:00–03:00
October
Oct 1 03:00–04:00 Oct 2 08:00–09:00 Oct 9 03:00–04:00 Oct 10 01:00–03:00 Oct 11 01:00–02:00 Oct 13 03:00–04:00 Oct 14 02:00–03:00, 08:00–09:00 Oct 16 03:00–04:00 Oct 17 05:00–06:00 Oct 19 02:00–03:00 Oct 20 03:00–04:00 Oct 21 04:00–05:00 Oct 22 02:00–03:00 Oct 23 04:00–05:00, 08:00–09:00 Oct 24 01:00–02:00 Oct 27 03:00–04:00, 08:00–09:00 Oct 28 03:00–04:00 Oct 29 08:00–09:00 Oct 30 02:00–03:00 Oct 31 02:00–03:00
November
Nov 1 03:00–04:00 Nov 3 01:00–02:00 Nov 4 02:00–04:00 Nov 5 08:00–09:00 Nov 6 02:00–03:00 Nov 21 01:00–02:00
December
Dec 5 01:00–02:00 Dec 8 07:00–08:00 Dec 17 03:00–04:00 Dec 18 02:00–05:00 Dec 22 00:00–02:00, 08:00–09:00 Dec 24 08:00–09:00 Dec 26 04:00–05:00 Dec 27 02:00–03:00 Dec 29 01:00–02:00