Most often in March, 27 days.
Highest follower count seen that year: 4,265.
January
Jan 1 01:00–03:00, 11:00–17:00, 21:00–24:00 Jan 2 00:00–01:00, 16:00–18:00, 20:00–24:00 Jan 3 00:00–02:00, 23:00–24:00 Jan 5 20:00–21:00 Jan 7 00:00–01:00, 23:00–24:00 Jan 8 03:00–12:00 Jan 9 03:00–05:00 Jan 10 03:00–04:00, 12:00–17:00, 22:00–24:00 Jan 11 00:00–05:00, 15:00–19:00, 22:00–24:00 Jan 12 13:00–18:00 Jan 13 15:00–16:00, 23:00–24:00 Jan 14 00:00–05:00, 22:00–24:00 Jan 15 00:00–01:00 Jan 16 00:00–03:00, 11:00–13:00, 15:00–20:00 Jan 17 00:00–04:00, 19:00–21:00 Jan 18 00:00–03:00 Jan 20 14:00–15:00 Jan 22 03:00–06:00, 13:00–15:00, 17:00–19:00, 22:00–24:00 Jan 23 00:00–01:00, 06:00–09:00 Jan 24 14:00–16:00, 20:00–22:00 Jan 25 15:00–18:00, 20:00–21:00
February
Feb 3 20:00–22:00 Feb 4 03:00–05:00 Feb 5 00:00–11:00 Feb 6 01:00–02:00, 04:00–06:00, 19:00–21:00 Feb 7 00:00–06:00, 08:00–10:00, 20:00–24:00 Feb 8 00:00–02:00, 04:00–11:00 Feb 9 12:00–18:00 Feb 11 01:00–09:00 Feb 13 20:00–24:00 Feb 14 20:00–24:00 Feb 15 00:00–01:00 Feb 16 16:00–18:00 Feb 18 22:00–24:00 Feb 19 00:00–02:00, 11:00–14:00 Feb 21 12:00–17:00, 19:00–24:00 Feb 22 03:00–06:00, 18:00–21:00 Feb 24 19:00–22:00 Feb 25 00:00–02:00, 18:00–21:00, 23:00–24:00 Feb 26 00:00–01:00, 18:00–19:00, 23:00–24:00 Feb 27 00:00–01:00, 20:00–22:00 Feb 28 18:00–24:00
March
Mar 1 00:00–03:00 Mar 2 17:00–24:00 Mar 4 16:00–18:00, 20:00–23:00 Mar 5 02:00–03:00 Mar 6 00:00–04:00, 19:00–24:00 Mar 7 03:00–05:00, 22:00–24:00 Mar 8 00:00–01:00, 03:00–07:00 Mar 9 22:00–24:00 Mar 10 00:00–07:00, 23:00–24:00 Mar 11 00:00–06:00 Mar 12 00:00–01:00 Mar 13 03:00–11:00 Mar 14 03:00–04:00 Mar 15 01:00–14:00 Mar 17 04:00–10:00 Mar 18 13:00–16:00 Mar 19 01:00–09:00 Mar 20 06:00–09:00, 20:00–24:00 Mar 21 00:00–01:00 Mar 22 22:00–24:00 Mar 23 00:00–02:00 Mar 24 19:00–23:00 Mar 25 00:00–02:00 Mar 27 00:00–01:00, 18:00–23:00 Mar 28 00:00–04:00, 17:00–20:00 Mar 29 00:00–02:00 Mar 30 20:00–22:00
April
Apr 3 20:00–23:00 Apr 4 00:00–01:00, 23:00–24:00 Apr 5 00:00–06:00 Apr 6 05:00–06:00 Apr 7 20:00–24:00 Apr 8 00:00–06:00, 22:00–23:00 Apr 9 21:00–24:00 Apr 10 00:00–03:00 Apr 12 02:00–06:00, 20:00–21:00 Apr 14 22:00–24:00 Apr 15 03:00–04:00, 16:00–17:00 Apr 16 17:00–18:00 Apr 17 00:00–06:00, 20:00–24:00 Apr 18 02:00–04:00, 14:00–24:00 Apr 21 18:00–21:00 Apr 22 21:00–22:00 Apr 23 20:00–21:00 Apr 24 12:00–16:00, 23:00–24:00 Apr 25 15:00–23:00 Apr 26 01:00–04:00 Apr 27 01:00–05:00, 21:00–24:00 Apr 29 20:00–21:00 Apr 30 03:00–04:00
May
May 2 01:00–03:00, 19:00–21:00 May 3 06:00–08:00 May 4 20:00–22:00 May 5 22:00–24:00 May 6 00:00–07:00 May 8 00:00–01:00 May 9 00:00–01:00, 23:00–24:00 May 10 00:00–01:00 May 22 01:00–04:00 May 23 21:00–23:00 May 26 20:00–21:00 May 27 04:00–07:00 May 28 04:00–07:00, 20:00–24:00
June
Jun 1 20:00–21:00 Jun 2 22:00–24:00 Jun 3 00:00–01:00, 20:00–24:00 Jun 4 00:00–06:00, 10:00–12:00 Jun 5 03:00–11:00 Jun 6 06:00–11:00 Jun 7 03:00–04:00 Jun 9 20:00–24:00 Jun 10 02:00–08:00 Jun 15 15:00–17:00, 23:00–24:00 Jun 16 00:00–04:00, 19:00–22:00 Jun 18 19:00–24:00 Jun 19 00:00–05:00, 18:00–20:00, 22:00–24:00 Jun 21 01:00–06:00 Jun 23 19:00–24:00 Jun 26 02:00–05:00
July
Jul 19 22:00–24:00 Jul 21 20:00–24:00 Jul 22 00:00–02:00, 19:00–24:00 Jul 23 00:00–03:00, 20:00–24:00 Jul 24 03:00–05:00 Jul 29 01:00–08:00, 18:00–22:00 Jul 30 01:00–07:00, 20:00–24:00 Jul 31 00:00–04:00, 19:00–22:00
August
Aug 1 02:00–04:00, 20:00–22:00 Aug 2 06:00–07:00 Aug 4 20:00–23:00 Aug 8 20:00–24:00 Aug 9 00:00–01:00 Aug 10 01:00–03:00 Aug 12 20:00–24:00 Aug 13 00:00–02:00 Aug 14 18:00–24:00 Aug 15 00:00–01:00, 19:00–21:00 Aug 18 18:00–24:00 Aug 19 00:00–03:00, 18:00–21:00 Aug 20 02:00–03:00, 18:00–22:00 Aug 21 21:00–24:00 Aug 22 00:00–04:00 Aug 25 19:00–22:00 Aug 29 16:00–19:00 Aug 30 02:00–10:00 Aug 31 10:00–16:00
September
Sep 5 03:00–11:00 Sep 8 20:00–23:00 Sep 9 20:00–23:00 Sep 11 19:00–24:00 Sep 12 00:00–01:00 Sep 15 22:00–24:00 Sep 16 00:00–06:00 Sep 17 03:00–08:00 Sep 18 21:00–24:00 Sep 19 00:00–01:00 Sep 20 02:00–04:00 Sep 23 23:00–24:00 Sep 26 03:00–05:00, 20:00–24:00 Sep 27 06:00–10:00 Sep 29 20:00–23:00 Sep 30 15:00–19:00
October
Oct 4 15:00–16:00, 21:00–24:00 Oct 5 00:00–05:00, 15:00–20:00 Oct 6 21:00–23:00 Oct 7 18:00–24:00 Oct 9 19:00–24:00 Oct 10 00:00–02:00 Oct 13 17:00–23:00 Oct 14 19:00–24:00 Oct 15 00:00–02:00 Oct 16 18:00–24:00 Oct 17 00:00–06:00 Oct 21 20:00–24:00 Oct 22 00:00–05:00 Oct 24 20:00–24:00 Oct 25 00:00–07:00 Oct 27 19:00–24:00 Oct 28 00:00–02:00, 22:00–24:00 Oct 29 00:00–03:00 Oct 31 21:00–24:00
November
Nov 4 14:00–17:00 Nov 5 18:00–22:00 Nov 7 02:00–06:00, 18:00–20:00 Nov 12 18:00–20:00 Nov 14 20:00–24:00 Nov 15 00:00–02:00 Nov 20 21:00–24:00 Nov 21 00:00–02:00 Nov 22 19:00–24:00 Nov 23 00:00–01:00, 06:00–10:00, 20:00–22:00 Nov 24 20:00–22:00 Nov 26 20:00–24:00 Nov 27 00:00–02:00 Nov 28 20:00–24:00 Nov 29 00:00–01:00
December
Dec 3 03:00–09:00 Dec 4 18:00–23:00 Dec 5 03:00–06:00, 18:00–22:00 Dec 6 18:00–22:00 Dec 7 04:00–07:00 Dec 8 19:00–24:00 Dec 9 00:00–02:00, 18:00–23:00 Dec 10 18:00–24:00 Dec 11 18:00–24:00 Dec 12 22:00–24:00 Dec 16 20:00–22:00 Dec 18 18:00–24:00 Dec 19 04:00–07:00, 16:00–19:00 Dec 20 02:00–05:00 Dec 22 21:00–24:00 Dec 24 20:00–24:00 Dec 25 00:00–06:00, 22:00–24:00 Dec 27 03:00–12:00 Dec 28 01:00–06:00, 12:00–13:00, 19:00–21:00 Dec 31 03:00–07:00, 15:00–19:00