Most often in May, 25 days.
Highest follower count seen that year: 15,571.
January
Jan 4 03:00–07:00, 22:00–24:00 Jan 5 22:00–24:00 Jan 6 00:00–03:00 Jan 7 02:00–05:00 Jan 8 04:00–07:00 Jan 10 21:00–23:00 Jan 11 19:00–23:00 Jan 12 14:00–17:00 Jan 14 00:00–03:00 Jan 15 23:00–24:00 Jan 16 00:00–01:00, 23:00–24:00 Jan 17 00:00–01:00 Jan 18 03:00–05:00, 21:00–23:00 Jan 21 22:00–24:00 Jan 22 00:00–01:00, 22:00–24:00 Jan 23 00:00–02:00 Jan 24 02:00–05:00 Jan 30 01:00–06:00, 20:00–24:00 Jan 31 22:00–24:00
February
Feb 2 06:00–08:00 Feb 3 22:00–24:00 Feb 4 00:00–02:00 Feb 5 03:00–06:00 Feb 6 00:00–02:00, 23:00–24:00 Feb 7 00:00–01:00 Feb 8 02:00–04:00, 22:00–24:00 Feb 9 00:00–01:00 Feb 10 22:00–24:00 Feb 11 00:00–01:00, 23:00–24:00 Feb 12 00:00–01:00 Feb 13 23:00–24:00 Feb 14 00:00–03:00 Feb 15 04:00–07:00, 21:00–23:00 Feb 17 02:00–05:00 Feb 19 00:00–02:00 Feb 20 00:00–03:00, 23:00–24:00 Feb 21 00:00–02:00 Feb 22 01:00–04:00 Feb 25 02:00–05:00, 23:00–24:00 Feb 26 00:00–03:00, 22:00–24:00 Feb 27 00:00–06:00 Feb 28 02:00–05:00
March
Mar 1 00:00–03:00 Mar 6 23:00–24:00 Mar 7 00:00–01:00, 20:00–23:00 Mar 8 18:00–21:00 Mar 9 23:00–24:00 Mar 10 00:00–02:00, 16:00–18:00 Mar 12 14:00–18:00, 21:00–24:00 Mar 13 02:00–03:00, 12:00–15:00 Mar 14 22:00–24:00 Mar 15 00:00–02:00, 19:00–22:00 Mar 17 23:00–24:00 Mar 18 00:00–04:00 Mar 19 22:00–24:00 Mar 20 00:00–04:00, 13:00–17:00 Mar 21 21:00–24:00 Mar 22 20:00–24:00 Mar 23 16:00–19:00, 21:00–24:00 Mar 24 00:00–02:00 Mar 25 23:00–24:00 Mar 26 00:00–03:00, 23:00–24:00 Mar 27 00:00–01:00, 12:00–16:00 Mar 28 21:00–24:00 Mar 29 00:00–03:00, 22:00–24:00 Mar 31 03:00–07:00, 22:00–24:00
April
Apr 1 00:00–02:00, 23:00–24:00 Apr 2 00:00–04:00, 23:00–24:00 Apr 3 00:00–02:00, 14:00–18:00 Apr 4 21:00–24:00 Apr 5 00:00–02:00 Apr 6 18:00–22:00 Apr 8 23:00–24:00 Apr 9 00:00–05:00, 22:00–24:00 Apr 10 00:00–01:00, 20:00–24:00 Apr 11 21:00–23:00 Apr 13 15:00–20:00 Apr 16 00:00–04:00, 23:00–24:00 Apr 17 00:00–02:00 Apr 18 00:00–03:00, 19:00–23:00 Apr 20 14:00–16:00 Apr 23 01:00–05:00, 23:00–24:00 Apr 24 00:00–02:00, 22:00–24:00 Apr 25 00:00–01:00, 21:00–23:00 Apr 28 22:00–24:00 Apr 29 00:00–01:00 Apr 30 02:00–04:00, 20:00–23:00
May
May 1 23:00–24:00 May 2 00:00–03:00, 21:00–24:00 May 3 00:00–01:00 May 4 21:00–23:00 May 6 03:00–08:00 May 7 00:00–03:00, 23:00–24:00 May 8 00:00–01:00 May 11 22:00–24:00 May 12 00:00–02:00 May 13 01:00–03:00 May 14 00:00–03:00, 23:00–24:00 May 15 00:00–01:00 May 16 23:00–24:00 May 17 00:00–03:00 May 18 16:00–24:00 May 19 00:00–01:00 May 21 03:00–07:00 May 22 22:00–24:00 May 23 00:00–02:00 May 24 22:00–24:00 May 25 00:00–02:00 May 28 00:00–03:00 May 29 00:00–03:00, 20:00–24:00 May 30 22:00–24:00 May 31 00:00–01:00, 18:00–22:00
June
Jun 1 16:00–20:00, 22:00–24:00 Jun 2 00:00–01:00 Jun 3 23:00–24:00 Jun 4 00:00–02:00, 23:00–24:00 Jun 5 00:00–03:00, 21:00–24:00 Jun 6 00:00–02:00, 22:00–24:00 Jun 7 00:00–02:00, 19:00–23:00 Jun 8 14:00–18:00 Jun 11 00:00–03:00, 20:00–24:00 Jun 12 00:00–01:00, 23:00–24:00 Jun 13 00:00–01:00, 22:00–23:00 Jun 15 04:00–08:00, 20:00–24:00 Jun 18 01:00–06:00 Jun 19 02:00–04:00 Jun 24 23:00–24:00 Jun 25 00:00–05:00, 23:00–24:00 Jun 26 00:00–01:00, 23:00–24:00 Jun 27 00:00–02:00, 21:00–24:00 Jun 28 00:00–01:00, 22:00–24:00 Jun 29 23:00–24:00 Jun 30 00:00–03:00, 21:00–24:00
July
Jul 1 00:00–04:00, 23:00–24:00 Jul 2 00:00–03:00 Jul 3 21:00–24:00 Jul 5 03:00–05:00, 22:00–24:00 Jul 6 00:00–03:00, 18:00–22:00 Jul 7 21:00–23:00 Jul 9 00:00–02:00 Jul 11 01:00–05:00, 22:00–24:00 Jul 14 00:00–03:00 Jul 15 20:00–22:00 Jul 16 23:00–24:00 Jul 17 00:00–01:00 Jul 18 04:00–08:00, 22:00–24:00 Jul 19 00:00–02:00 Jul 20 06:00–10:00 Jul 23 04:00–09:00, 22:00–24:00 Jul 24 00:00–01:00, 22:00–24:00 Jul 25 00:00–01:00, 22:00–24:00 Jul 26 00:00–02:00, 22:00–24:00 Jul 27 00:00–03:00 Jul 29 04:00–09:00, 21:00–24:00 Jul 30 22:00–24:00 Jul 31 00:00–02:00, 15:00–18:00
August
Aug 3 23:00–24:00 Aug 4 00:00–02:00, 19:00–23:00 Aug 6 23:00–24:00 Aug 7 00:00–01:00, 15:00–16:00 Aug 9 20:00–23:00 Aug 10 22:00–24:00 Aug 11 00:00–01:00, 21:00–24:00 Aug 13 23:00–24:00 Aug 14 15:00–19:00 Aug 15 22:00–24:00 Aug 16 00:00–02:00 Aug 18 00:00–04:00, 19:00–21:00 Aug 20 22:00–24:00 Aug 21 00:00–03:00, 16:00–20:00 Aug 23 02:00–06:00, 19:00–23:00 Aug 24 22:00–24:00 Aug 25 00:00–02:00, 23:00–24:00 Aug 26 00:00–03:00 Aug 27 22:00–24:00 Aug 28 00:00–01:00, 16:00–18:00 Aug 29 12:00–14:00 Aug 30 21:00–24:00
September
Sep 3 00:00–05:00 Sep 4 16:00–19:00 Sep 6 22:00–24:00 Sep 7 00:00–01:00, 22:00–24:00 Sep 8 00:00–02:00, 18:00–21:00 Sep 10 22:00–24:00 Sep 11 00:00–01:00, 15:00–18:00 Sep 13 03:00–06:00, 20:00–23:00 Sep 17 00:00–04:00 Sep 20 04:00–05:00, 19:00–21:00 Sep 21 22:00–24:00 Sep 22 00:00–02:00 Sep 24 00:00–03:00, 23:00–24:00 Sep 25 00:00–01:00, 23:00–24:00 Sep 26 00:00–02:00 Sep 27 04:00–08:00, 19:00–21:00 Sep 29 05:00–08:00
October
Oct 1 01:00–04:00 Oct 2 15:00–18:00 Oct 3 21:00–24:00 Oct 4 20:00–23:00 Oct 5 22:00–24:00 Oct 6 00:00–01:00 Oct 8 03:00–08:00, 23:00–24:00 Oct 9 16:00–18:00, 21:00–24:00 Oct 11 19:00–24:00 Oct 12 09:00–15:00 Oct 15 23:00–24:00 Oct 16 14:00–18:00 Oct 18 05:00–08:00, 19:00–21:00 Oct 19 22:00–24:00 Oct 20 00:00–01:00 Oct 22 04:00–06:00, 20:00–22:00 Oct 24 21:00–24:00 Oct 25 00:00–05:00 Oct 26 22:00–23:00 Oct 28 03:00–05:00, 20:00–24:00 Oct 29 22:00–24:00 Oct 30 00:00–01:00, 13:00–14:00
November
Nov 1 19:00–23:00 Nov 2 22:00–24:00 Nov 3 00:00–02:00 Nov 5 23:00–24:00 Nov 6 00:00–01:00 Nov 8 04:00–07:00, 22:00–24:00 Nov 9 00:00–01:00, 22:00–24:00 Nov 10 00:00–02:00 Nov 12 23:00–24:00 Nov 13 00:00–02:00, 14:00–22:00 Nov 14 23:00–24:00 Nov 15 00:00–01:00 Nov 16 02:00–06:00, 22:00–24:00 Nov 17 00:00–02:00 Nov 19 02:00–05:00, 22:00–24:00 Nov 20 18:00–22:00 Nov 21 20:00–23:00 Nov 23 19:00–22:00 Nov 26 12:00–14:00 Nov 27 16:00–17:00 Nov 29 04:00–07:00 Nov 30 22:00–24:00
December
Dec 1 00:00–02:00 Dec 3 01:00–03:00, 23:00–24:00 Dec 4 00:00–02:00, 21:00–24:00 Dec 5 21:00–23:00 Dec 7 05:00–09:00, 22:00–24:00 Dec 8 00:00–01:00 Dec 11 23:00–24:00 Dec 12 21:00–24:00 Dec 13 00:00–01:00 Dec 14 03:00–06:00, 16:00–18:00 Dec 16 20:00–24:00 Dec 17 23:00–24:00 Dec 18 00:00–01:00, 22:00–24:00 Dec 19 00:00–02:00 Dec 20 01:00–04:00, 21:00–24:00 Dec 23 03:00–07:00 Dec 24 21:00–24:00 Dec 25 22:00–24:00 Dec 27 03:00–06:00 Dec 28 04:00–07:00, 23:00–24:00 Dec 29 00:00–02:00, 23:00–24:00 Dec 30 00:00–02:00