Most often in October, 25 days.
Highest follower count seen that year: 9,420.
January
Jan 3 00:00–01:00 Jan 4 03:00–04:00 Jan 5 23:00–24:00 Jan 6 04:00–05:00 Jan 7 21:00–22:00 Jan 8 00:00–02:00 Jan 9 21:00–24:00 Jan 10 00:00–01:00 Jan 12 22:00–24:00 Jan 13 00:00–01:00 Jan 14 02:00–06:00 Jan 16 02:00–04:00, 22:00–24:00 Jan 17 00:00–02:00 Jan 19 23:00–24:00 Jan 20 00:00–02:00 Jan 21 04:00–05:00 Jan 22 01:00–02:00 Jan 23 21:00–22:00 Jan 28 00:00–02:00, 23:00–24:00 Jan 29 00:00–01:00 Jan 30 23:00–24:00 Jan 31 00:00–02:00
February
Feb 6 01:00–03:00 Feb 11 02:00–03:00 Feb 13 21:00–24:00 Feb 17 22:00–24:00 Feb 19 22:00–23:00 Feb 20 01:00–03:00 Feb 21 01:00–04:00 Feb 27 21:00–24:00 Feb 28 00:00–01:00
March
Mar 2 23:00–24:00 Mar 3 03:00–04:00 Mar 4 23:00–24:00 Mar 5 00:00–03:00 Mar 7 00:00–03:00 Mar 10 03:00–04:00 Mar 12 02:00–04:00 Mar 14 01:00–04:00 Mar 16 21:00–24:00 Mar 17 00:00–04:00, 21:00–24:00 Mar 18 00:00–01:00, 23:00–24:00 Mar 19 00:00–06:00 Mar 20 21:00–24:00 Mar 21 00:00–01:00 Mar 23 21:00–24:00 Mar 24 00:00–02:00 Mar 25 23:00–24:00 Mar 26 00:00–05:00 Mar 27 21:00–23:00 Mar 28 00:00–01:00, 03:00–04:00
April
Apr 8 23:00–24:00 Apr 9 00:00–01:00, 04:00–06:00 Apr 14 01:00–05:00 Apr 21 21:00–24:00 Apr 22 00:00–01:00 Apr 23 04:00–06:00 Apr 24 01:00–08:00 Apr 27 07:00–08:00 Apr 28 03:00–05:00 Apr 30 01:00–04:00
May
May 2 00:00–04:00 May 4 23:00–24:00 May 5 00:00–01:00 May 6 00:00–03:00 May 7 06:00–07:00, 10:00–12:00 May 8 22:00–23:00 May 9 00:00–02:00 May 12 04:00–05:00, 23:00–24:00 May 13 00:00–01:00, 03:00–04:00 May 16 01:00–04:00 May 19 21:00–24:00 May 20 00:00–01:00 May 21 05:00–06:00 May 23 00:00–02:00 May 26 00:00–04:00 May 28 01:00–05:00 May 30 03:00–05:00
June
Jun 2 01:00–05:00 Jun 3 00:00–03:00 Jun 4 03:00–06:00 Jun 5 23:00–24:00 Jun 6 00:00–03:00 Jun 10 02:00–04:00 Jun 11 01:00–05:00 Jun 12 02:00–05:00 Jun 13 01:00–03:00 Jun 15 04:00–05:00 Jun 16 04:00–06:00 Jun 17 00:00–03:00 Jun 18 02:00–06:00 Jun 20 02:00–06:00 Jun 25 23:00–24:00 Jun 26 00:00–03:00 Jun 29 23:00–24:00 Jun 30 00:00–07:00
July
Jul 1 03:00–05:00 Jul 2 04:00–07:00 Jul 3 07:00–08:00 Jul 4 02:00–06:00 Jul 7 04:00–06:00 Jul 8 01:00–05:00 Jul 9 01:00–03:00 Jul 11 00:00–03:00 Jul 13 23:00–24:00 Jul 14 00:00–01:00 Jul 15 00:00–06:00 Jul 16 04:00–05:00 Jul 21 04:00–06:00 Jul 23 01:00–04:00
August
Aug 1 05:00–06:00 Aug 3 01:00–03:00 Aug 4 01:00–02:00 Aug 6 02:00–04:00 Aug 8 00:00–02:00 Aug 11 04:00–05:00 Aug 13 00:00–01:00, 03:00–05:00 Aug 14 03:00–05:00 Aug 16 06:00–07:00 Aug 18 05:00–06:00 Aug 19 01:00–03:00 Aug 21 05:00–08:00 Aug 22 03:00–05:00 Aug 24 06:00–08:00 Aug 25 00:00–01:00, 04:00–07:00 Aug 27 00:00–01:00, 03:00–04:00 Aug 28 03:00–05:00 Aug 29 01:00–02:00
September
Sep 1 03:00–05:00 Sep 2 05:00–07:00 Sep 3 03:00–07:00 Sep 5 03:00–05:00 Sep 7 23:00–24:00 Sep 8 22:00–24:00 Sep 10 02:00–07:00 Sep 11 02:00–04:00 Sep 12 03:00–06:00 Sep 13 06:00–07:00 Sep 15 10:00–12:00 Sep 16 12:00–14:00 Sep 18 01:00–04:00 Sep 19 00:00–04:00 Sep 20 23:00–24:00 Sep 21 03:00–06:00, 09:00–10:00, 13:00–14:00, 18:00–19:00, 23:00–24:00 Sep 22 00:00–03:00 Sep 23 00:00–02:00 Sep 24 02:00–04:00, 22:00–24:00 Sep 25 01:00–06:00 Sep 28 03:00–05:00 Sep 29 04:00–05:00
October
Oct 1 10:00–13:00 Oct 2 22:00–23:00 Oct 3 01:00–04:00 Oct 6 05:00–06:00 Oct 7 01:00–04:00 Oct 8 02:00–06:00, 09:00–10:00 Oct 9 00:00–04:00, 22:00–24:00 Oct 10 00:00–02:00 Oct 11 06:00–07:00 Oct 12 22:00–24:00 Oct 13 00:00–01:00 Oct 14 03:00–04:00, 22:00–24:00 Oct 15 03:00–04:00 Oct 17 03:00–04:00 Oct 19 22:00–24:00 Oct 20 00:00–01:00 Oct 21 01:00–03:00, 23:00–24:00 Oct 22 00:00–03:00, 21:00–24:00 Oct 23 03:00–05:00 Oct 24 04:00–05:00 Oct 26 21:00–24:00 Oct 27 03:00–04:00 Oct 28 00:00–04:00, 23:00–24:00 Oct 29 00:00–01:00 Oct 31 01:00–02:00
November
Nov 3 01:00–04:00 Nov 4 03:00–04:00 Nov 5 03:00–06:00, 23:00–24:00 Nov 11 01:00–03:00, 23:00–24:00 Nov 12 00:00–03:00 Nov 13 23:00–24:00 Nov 17 02:00–04:00 Nov 18 22:00–24:00 Nov 19 00:00–05:00, 23:00–24:00 Nov 20 00:00–01:00, 23:00–24:00 Nov 21 00:00–04:00 Nov 23 03:00–06:00 Nov 25 00:00–02:00 Nov 26 00:00–05:00 Nov 27 22:00–24:00 Nov 28 00:00–04:00
December
Dec 1 00:00–05:00, 22:00–24:00 Dec 2 01:00–05:00 Dec 4 22:00–24:00 Dec 5 00:00–03:00 Dec 7 21:00–23:00 Dec 8 21:00–24:00 Dec 9 00:00–01:00, 21:00–24:00 Dec 10 01:00–05:00, 23:00–24:00 Dec 11 00:00–02:00, 23:00–24:00 Dec 12 00:00–05:00 Dec 14 21:00–24:00 Dec 15 03:00–04:00, 22:00–24:00 Dec 16 00:00–02:00, 23:00–24:00 Dec 17 00:00–05:00, 21:00–24:00 Dec 18 01:00–05:00, 23:00–24:00 Dec 19 00:00–02:00 Dec 20 05:00–06:00 Dec 22 21:00–24:00