Most often in March, 27 days.
Highest follower count seen that year: 164,238.
February
Feb 27 08:00–15:00
March
Mar 1 09:00–17:00 Mar 2 05:00–12:00 Mar 3 05:00–12:00 Mar 4 06:00–12:00 Mar 5 06:00–12:00 Mar 6 05:00–12:00, 17:00–23:00 Mar 7 05:00–13:00 Mar 9 04:00–12:00 Mar 10 05:00–12:00 Mar 11 04:00–12:00, 17:00–24:00 Mar 12 17:00–24:00 Mar 13 04:00–12:00 Mar 14 05:00–12:00 Mar 15 12:00–20:00 Mar 16 05:00–20:00 Mar 18 05:00–20:00 Mar 19 05:00–19:00 Mar 20 04:00–11:00 Mar 21 04:00–19:00 Mar 22 03:00–18:00 Mar 24 12:00–20:00 Mar 25 04:00–13:00 Mar 26 06:00–13:00 Mar 27 05:00–19:00 Mar 28 05:00–06:00, 09:00–19:00 Mar 29 12:00–19:00 Mar 30 05:00–18:00
April
Apr 1 05:00–20:00 Apr 2 06:00–13:00 Apr 3 13:00–19:00 Apr 4 10:00–16:00 Apr 5 05:00–14:00 Apr 6 08:00–09:00, 11:00–13:00 Apr 8 07:00–13:00 Apr 9 07:00–13:00 Apr 10 06:00–14:00 Apr 12 07:00–15:00 Apr 13 06:00–13:00 Apr 15 03:00–10:00 Apr 16 05:00–14:00 Apr 17 06:00–14:00 Apr 19 09:00–10:00, 12:00–13:00 Apr 20 08:00–11:00 Apr 22 06:00–13:00 Apr 23 06:00–14:00 Apr 24 07:00–12:00 Apr 26 06:00–11:00 Apr 27 08:00–14:00 Apr 28 07:00–13:00 Apr 30 04:00–11:00
May
May 1 04:00–11:00 May 2 05:00–12:00 May 3 04:00–11:00 May 6 05:00–11:00, 14:00–21:00 May 7 04:00–11:00, 14:00–21:00 May 8 04:00–07:00, 09:00–11:00, 13:00–20:00 May 9 14:00–21:00 May 10 04:00–20:00 May 11 04:00–11:00 May 13 06:00–13:00 May 14 06:00–14:00 May 16 07:00–15:00 May 17 04:00–12:00 May 18 08:00–15:00 May 20 05:00–12:00 May 21 06:00–12:00 May 22 07:00–11:00 May 23 06:00–13:00 May 25 07:00–12:00 May 26 05:00–12:00 May 28 21:00–24:00 May 29 00:00–04:00, 21:00–24:00 May 30 00:00–04:00, 21:00–24:00 May 31 01:00–04:00, 21:00–24:00
June
Jun 1 00:00–03:00 Jun 3 22:00–24:00 Jun 4 00:00–04:00, 21:00–24:00 Jun 5 00:00–03:00, 20:00–24:00 Jun 6 00:00–04:00, 21:00–24:00 Jun 7 00:00–02:00, 21:00–24:00 Jun 8 00:00–02:00 Jun 10 20:00–24:00 Jun 11 00:00–04:00, 20:00–24:00 Jun 12 00:00–03:00, 20:00–24:00 Jun 13 00:00–04:00 Jun 14 21:00–24:00 Jun 15 00:00–03:00, 21:00–24:00 Jun 16 00:00–05:00, 12:00–18:00 Jun 17 05:00–12:00, 21:00–24:00 Jun 18 00:00–05:00, 22:00–24:00 Jun 19 00:00–11:00, 21:00–24:00 Jun 20 00:00–05:00 Jun 23 23:00–24:00 Jun 24 00:00–05:00, 20:00–24:00 Jun 25 00:00–02:00, 22:00–24:00 Jun 26 00:00–04:00, 21:00–24:00 Jun 27 00:00–04:00, 21:00–24:00 Jun 28 00:00–05:00
July
Jul 1 21:00–24:00 Jul 2 00:00–05:00, 22:00–24:00 Jul 3 00:00–04:00 Jul 4 01:00–08:00, 21:00–24:00 Jul 5 00:00–05:00, 21:00–24:00 Jul 6 00:00–02:00 Jul 7 21:00–24:00 Jul 8 00:00–04:00, 21:00–24:00 Jul 9 00:00–04:00, 22:00–24:00 Jul 10 00:00–06:00, 22:00–24:00 Jul 11 00:00–08:00 Jul 12 22:00–24:00 Jul 13 00:00–05:00, 21:00–24:00 Jul 14 00:00–04:00, 21:00–24:00 Jul 15 00:00–05:00, 21:00–24:00 Jul 16 00:00–05:00 Jul 21 21:00–24:00 Jul 22 00:00–05:00, 21:00–24:00 Jul 23 00:00–04:00, 21:00–24:00 Jul 24 00:00–05:00, 21:00–24:00 Jul 25 00:00–04:00, 21:00–24:00 Jul 26 00:00–05:00, 21:00–24:00 Jul 27 00:00–05:00, 22:00–24:00 Jul 28 00:00–05:00, 20:00–24:00 Jul 29 00:00–04:00, 21:00–24:00 Jul 30 00:00–05:00
August
Aug 1 22:00–24:00 Aug 2 00:00–05:00, 23:00–24:00 Aug 3 00:00–05:00 Aug 6 22:00–24:00 Aug 7 00:00–06:00, 20:00–24:00 Aug 8 00:00–05:00, 21:00–24:00 Aug 9 00:00–05:00, 21:00–24:00 Aug 10 00:00–04:00 Aug 11 21:00–24:00 Aug 12 00:00–05:00, 21:00–24:00 Aug 13 00:00–04:00, 21:00–24:00 Aug 14 00:00–04:00 Aug 15 21:00–24:00 Aug 16 00:00–05:00, 20:00–24:00 Aug 17 00:00–04:00 Aug 18 20:00–24:00 Aug 19 00:00–05:00, 21:00–24:00 Aug 20 00:00–05:00, 21:00–24:00 Aug 21 00:00–05:00, 21:00–24:00 Aug 22 00:00–05:00, 22:00–24:00 Aug 23 00:00–06:00 Aug 25 20:00–24:00 Aug 26 00:00–01:00 Aug 28 21:00–24:00 Aug 29 00:00–04:00, 21:00–24:00 Aug 30 00:00–03:00, 20:00–24:00 Aug 31 00:00–03:00
September
Sep 1 22:00–24:00 Sep 2 00:00–06:00, 20:00–24:00 Sep 3 00:00–03:00, 21:00–24:00 Sep 4 00:00–04:00 Sep 6 20:00–24:00 Sep 7 00:00–05:00, 19:00–24:00 Sep 8 00:00–03:00 Sep 9 20:00–24:00 Sep 10 00:00–03:00, 21:00–24:00 Sep 11 00:00–04:00, 22:00–24:00 Sep 12 00:00–05:00, 22:00–24:00 Sep 13 00:00–05:00 Sep 14 21:00–24:00 Sep 15 00:00–05:00 Sep 17 21:00–24:00 Sep 18 00:00–04:00, 20:00–24:00 Sep 19 00:00–04:00, 21:00–24:00 Sep 20 00:00–04:00, 20:00–24:00 Sep 21 00:00–03:00 Sep 22 20:00–24:00 Sep 23 00:00–04:00, 21:00–24:00 Sep 24 00:00–04:00, 21:00–24:00 Sep 25 00:00–04:00, 21:00–24:00 Sep 26 00:00–04:00 Sep 27 20:00–24:00 Sep 28 00:00–04:00, 20:00–24:00 Sep 29 00:00–02:00
October
Oct 1 20:00–24:00 Oct 2 00:00–03:00, 19:00–24:00 Oct 3 00:00–03:00, 20:00–24:00 Oct 4 00:00–03:00, 20:00–24:00 Oct 5 00:00–03:00 Oct 7 22:00–24:00 Oct 8 00:00–03:00, 21:00–24:00 Oct 9 00:00–03:00, 15:00–24:00 Oct 10 00:00–06:00, 20:00–24:00 Oct 11 00:00–04:00, 21:00–24:00 Oct 12 00:00–03:00 Oct 15 20:00–24:00 Oct 16 00:00–06:00, 20:00–24:00 Oct 17 00:00–03:00, 20:00–24:00 Oct 18 00:00–03:00, 21:00–24:00 Oct 19 00:00–04:00 Oct 23 22:00–24:00 Oct 24 00:00–06:00, 21:00–24:00 Oct 25 00:00–04:00, 22:00–24:00 Oct 26 00:00–08:00, 20:00–24:00 Oct 27 00:00–04:00, 22:00–24:00 Oct 28 00:00–06:00 Oct 30 23:00–24:00 Oct 31 00:00–04:00, 21:00–24:00
November
Nov 1 00:00–04:00, 21:00–24:00 Nov 2 00:00–05:00 Nov 4 21:00–24:00 Nov 5 00:00–04:00, 21:00–24:00 Nov 6 00:00–03:00 Nov 7 20:00–21:00 Nov 8 21:00–24:00 Nov 9 00:00–04:00 Nov 10 22:00–24:00 Nov 11 00:00–03:00, 21:00–24:00 Nov 12 00:00–04:00, 21:00–24:00 Nov 13 00:00–03:00, 20:00–24:00 Nov 14 00:00–03:00 Nov 15 21:00–24:00 Nov 16 00:00–05:00 Nov 19 22:00–24:00 Nov 20 00:00–06:00, 22:00–24:00 Nov 21 00:00–05:00, 22:00–24:00 Nov 22 00:00–05:00, 22:00–24:00 Nov 23 00:00–06:00 Nov 25 22:00–24:00 Nov 26 00:00–06:00, 21:00–24:00 Nov 27 00:00–06:00, 22:00–24:00 Nov 28 00:00–05:00, 23:00–24:00 Nov 29 00:00–06:00, 21:00–24:00 Nov 30 00:00–07:00
December
Dec 1 21:00–24:00 Dec 2 00:00–05:00 Dec 3 21:00–24:00 Dec 4 00:00–04:00, 22:00–24:00 Dec 5 00:00–06:00, 21:00–24:00 Dec 6 00:00–05:00, 23:00–24:00 Dec 7 00:00–06:00, 21:00–24:00 Dec 8 00:00–06:00 Dec 12 22:00–24:00 Dec 13 00:00–05:00, 21:00–24:00 Dec 14 00:00–04:00, 22:00–24:00 Dec 15 00:00–05:00 Dec 16 21:00–24:00 Dec 17 00:00–02:00, 22:00–24:00 Dec 18 00:00–05:00 Dec 19 21:00–24:00 Dec 20 00:00–05:00, 22:00–24:00 Dec 21 00:00–04:00 Dec 23 22:00–24:00 Dec 24 00:00–04:00 Dec 25 22:00–24:00 Dec 26 00:00–05:00, 22:00–24:00 Dec 27 00:00–03:00 Dec 28 16:00–22:00 Dec 30 18:00–24:00 Dec 31 00:00–01:00