Most often in October, 29 days.
Highest follower count seen that year: 32,687.
January
Jan 5 01:00–04:00 Jan 6 01:00–04:00 Jan 7 02:00–04:00 Jan 8 01:00–04:00 Jan 10 01:00–04:00 Jan 11 01:00–04:00 Jan 12 02:00–04:00 Jan 13 01:00–03:00 Jan 14 00:00–03:00 Jan 16 01:00–04:00 Jan 18 01:00–03:00 Jan 20 02:00–04:00 Jan 21 02:00–04:00 Jan 22 02:00–04:00 Jan 23 01:00–03:00 Jan 25 01:00–04:00 Jan 26 01:00–04:00 Jan 27 01:00–04:00 Jan 28 02:00–04:00 Jan 30 01:00–04:00 Jan 31 02:00–03:00
February
Feb 1 01:00–03:00 Feb 2 01:00–04:00 Feb 4 02:00–03:00 Feb 5 02:00–04:00 Feb 6 01:00–04:00 Feb 7 01:00–04:00 Feb 9 01:00–04:00 Feb 10 01:00–04:00 Feb 11 01:00–04:00 Feb 12 01:00–03:00 Feb 14 01:00–05:00 Feb 15 01:00–04:00 Feb 16 02:00–04:00 Feb 17 01:00–04:00 Feb 18 01:00–05:00 Feb 20 01:00–04:00, 19:00–21:00 Feb 21 02:00–04:00 Feb 22 02:00–04:00 Feb 24 01:00–03:00 Feb 25 01:00–04:00 Feb 26 01:00–04:00 Feb 27 01:00–04:00
March
Mar 1 01:00–04:00 Mar 2 01:00–05:00 Mar 3 01:00–03:00 Mar 4 02:00–04:00 Mar 6 01:00–03:00 Mar 7 03:00–04:00 Mar 8 01:00–03:00 Mar 9 02:00–04:00 Mar 11 02:00–04:00 Mar 12 01:00–04:00 Mar 13 03:00–04:00 Mar 14 03:00–04:00 Mar 16 00:00–04:00 Mar 18 01:00–04:00 Mar 19 01:00–04:00 Mar 21 01:00–04:00 Mar 22 01:00–04:00 Mar 23 01:00–04:00 Mar 24 01:00–04:00 Mar 26 00:00–04:00 Mar 27 00:00–03:00 Mar 28 01:00–04:00 Mar 29 01:00–04:00
April
Apr 2 01:00–05:00 Apr 3 01:00–04:00 Apr 4 01:00–04:00 Apr 5 00:00–04:00 Apr 6 02:00–03:00 Apr 8 01:00–04:00 Apr 9 01:00–04:00 Apr 10 01:00–03:00 Apr 11 01:00–04:00 Apr 12 01:00–04:00 Apr 13 00:00–04:00 Apr 15 01:00–04:00 Apr 16 00:00–04:00 Apr 17 01:00–04:00 Apr 18 01:00–04:00 Apr 19 00:00–04:00 Apr 21 00:00–01:00 Apr 22 00:00–03:00 Apr 23 01:00–04:00 Apr 25 01:00–04:00 Apr 26 01:00–03:00 Apr 27 00:00–03:00 Apr 28 00:00–01:00 Apr 30 01:00–02:00
May
May 3 00:00–03:00 May 4 19:00–21:00 May 5 04:00–05:00 May 6 01:00–04:00 May 7 00:00–04:00 May 8 01:00–04:00 May 9 00:00–04:00 May 10 01:00–05:00 May 11 02:00–05:00 May 12 01:00–03:00 May 13 01:00–03:00 May 14 01:00–04:00 May 15 01:00–05:00 May 16 00:00–04:00 May 17 01:00–04:00 May 18 01:00–04:00 May 20 00:00–04:00 May 21 00:00–04:00 May 22 01:00–03:00 May 25 00:00–04:00 May 26 00:00–04:00 May 27 00:00–04:00 May 28 01:00–03:00 May 30 00:00–04:00 May 31 00:00–04:00
June
Jun 1 02:00–05:00 Jun 2 00:00–04:00 Jun 4 00:00–04:00 Jun 5 01:00–04:00 Jun 7 01:00–04:00 Jun 8 01:00–04:00 Jun 9 01:00–03:00 Jun 12 00:00–03:00 Jun 13 01:00–04:00 Jun 14 00:00–04:00 Jun 15 01:00–04:00 Jun 16 00:00–03:00 Jun 17 00:00–04:00 Jun 18 00:00–04:00 Jun 19 01:00–04:00 Jun 20 00:00–02:00 Jun 21 00:00–04:00 Jun 22 01:00–04:00 Jun 25 00:00–03:00 Jun 26 00:00–04:00 Jun 27 01:00–03:00
July
Jul 5 01:00–04:00 Jul 6 19:00–24:00 Jul 7 00:00–01:00, 21:00–24:00 Jul 8 00:00–03:00, 21:00–24:00 Jul 9 00:00–03:00, 22:00–24:00 Jul 10 00:00–04:00, 20:00–21:00, 23:00–24:00 Jul 11 00:00–03:00, 21:00–24:00 Jul 12 00:00–03:00, 23:00–24:00 Jul 13 00:00–04:00, 21:00–24:00 Jul 14 00:00–01:00 Jul 15 21:00–24:00 Jul 16 00:00–02:00, 21:00–24:00 Jul 17 00:00–02:00, 23:00–24:00 Jul 18 00:00–03:00, 21:00–24:00 Jul 19 00:00–02:00, 19:00–22:00 Jul 20 20:00–24:00 Jul 21 00:00–01:00, 21:00–24:00 Jul 22 00:00–02:00, 22:00–24:00 Jul 23 00:00–02:00, 21:00–24:00 Jul 24 00:00–03:00, 23:00–24:00 Jul 25 00:00–03:00 Jul 26 20:00–23:00 Jul 27 20:00–24:00 Jul 28 22:00–24:00 Jul 29 00:00–01:00, 22:00–24:00 Jul 30 00:00–01:00 Jul 31 22:00–24:00
August
Aug 1 00:00–01:00, 22:00–24:00 Aug 2 00:00–01:00, 03:00–06:00, 21:00–24:00 Aug 3 00:00–01:00, 04:00–06:00, 18:00–24:00 Aug 4 00:00–02:00, 22:00–24:00 Aug 5 00:00–01:00, 21:00–24:00 Aug 6 00:00–01:00, 03:00–05:00, 23:00–24:00 Aug 7 00:00–05:00, 22:00–24:00 Aug 8 00:00–03:00, 23:00–24:00 Aug 9 00:00–04:00, 22:00–24:00 Aug 10 00:00–05:00, 20:00–24:00 Aug 11 00:00–02:00, 23:00–24:00 Aug 12 21:00–24:00 Aug 13 00:00–03:00, 21:00–24:00 Aug 14 00:00–02:00, 21:00–24:00 Aug 15 00:00–01:00, 21:00–24:00 Aug 16 00:00–01:00 Aug 18 20:00–24:00 Aug 19 21:00–24:00 Aug 20 00:00–01:00, 21:00–24:00 Aug 21 00:00–01:00, 21:00–24:00 Aug 22 00:00–03:00, 21:00–24:00 Aug 23 00:00–03:00 Aug 25 22:00–24:00 Aug 26 00:00–01:00, 22:00–23:00 Aug 27 00:00–01:00, 21:00–24:00 Aug 28 22:00–24:00 Aug 29 22:00–24:00 Aug 30 00:00–01:00
September
Sep 1 19:00–24:00 Sep 2 22:00–24:00 Sep 3 00:00–01:00, 22:00–24:00 Sep 4 00:00–02:00, 21:00–23:00 Sep 5 20:00–24:00 Sep 6 20:00–24:00 Sep 7 00:00–01:00, 19:00–24:00 Sep 8 00:00–01:00, 20:00–24:00 Sep 9 00:00–01:00, 22:00–24:00 Sep 10 00:00–01:00 Sep 11 20:00–24:00 Sep 12 20:00–22:00 Sep 13 20:00–24:00 Sep 14 19:00–24:00 Sep 15 20:00–24:00 Sep 17 22:00–24:00 Sep 18 20:00–22:00 Sep 19 21:00–24:00 Sep 20 21:00–24:00 Sep 21 20:00–24:00 Sep 22 00:00–01:00
October
Oct 2 23:00–24:00 Oct 3 00:00–01:00, 22:00–24:00 Oct 4 00:00–01:00, 22:00–24:00 Oct 5 00:00–01:00 Oct 6 22:00–24:00 Oct 7 00:00–01:00, 23:00–24:00 Oct 8 22:00–24:00 Oct 9 00:00–01:00, 23:00–24:00 Oct 10 00:00–02:00 Oct 11 00:00–02:00 Oct 12 22:00–24:00 Oct 13 00:00–02:00, 22:00–24:00 Oct 14 00:00–02:00, 22:00–24:00 Oct 15 00:00–01:00, 22:00–24:00 Oct 16 00:00–02:00 Oct 17 23:00–24:00 Oct 18 00:00–03:00 Oct 19 19:00–24:00 Oct 20 20:00–23:00 Oct 21 23:00–24:00 Oct 22 00:00–02:00, 18:00–19:00, 23:00–24:00 Oct 23 00:00–01:00 Oct 24 00:00–01:00, 23:00–24:00 Oct 25 00:00–02:00 Oct 27 22:00–24:00 Oct 28 00:00–01:00, 21:00–24:00 Oct 29 21:00–24:00 Oct 30 21:00–24:00 Oct 31 20:00–24:00
November
Nov 3 19:00–24:00 Nov 4 22:00–24:00 Nov 6 00:00–03:00 Nov 7 01:00–03:00 Nov 10 23:00–24:00 Nov 11 00:00–02:00 Nov 12 00:00–02:00 Nov 13 00:00–02:00, 23:00–24:00 Nov 14 00:00–02:00 Nov 16 22:00–24:00 Nov 17 00:00–03:00 Nov 18 21:00–24:00 Nov 19 00:00–01:00 Nov 20 00:00–02:00 Nov 22 23:00–24:00 Nov 23 20:00–24:00 Nov 24 00:00–02:00, 23:00–24:00 Nov 25 00:00–01:00, 23:00–24:00 Nov 26 00:00–01:00
December
Dec 29 01:00–04:00 Dec 30 02:00–03:00