Most often in November, 22 days.
Highest follower count seen that year: 10,117.
January
Jan 2 13:00–15:00 Jan 4 14:00–16:00 Jan 6 12:00–14:00 Jan 7 12:00–14:00 Jan 8 12:00–13:00 Jan 9 01:00–02:00 Jan 11 13:00–15:00 Jan 12 23:00–24:00 Jan 15 11:00–13:00, 22:00–24:00 Jan 16 04:00–06:00, 23:00–24:00 Jan 17 00:00–01:00 Jan 18 12:00–15:00 Jan 20 15:00–17:00 Jan 22 12:00–13:00 Jan 23 12:00–13:00 Jan 25 13:00–14:00 Jan 28 12:00–14:00 Jan 30 02:00–03:00, 13:00–15:00
February
Feb 2 12:00–14:00 Feb 3 13:00–14:00 Feb 4 12:00–14:00 Feb 5 12:00–14:00 Feb 6 12:00–15:00 Feb 7 00:00–01:00, 03:00–05:00 Feb 8 12:00–14:00 Feb 9 12:00–14:00 Feb 11 12:00–14:00 Feb 13 04:00–05:00 Feb 16 12:00–14:00, 23:00–24:00 Feb 17 00:00–01:00 Feb 20 04:00–05:00, 12:00–13:00 Feb 21 12:00–14:00 Feb 22 12:00–14:00 Feb 24 12:00–13:00 Feb 25 02:00–05:00 Feb 26 23:00–24:00 Feb 27 01:00–02:00 Feb 28 12:00–14:00
March
Mar 1 13:00–14:00 Mar 6 13:00–14:00, 23:00–24:00 Mar 9 14:00–15:00 Mar 10 12:00–14:00 Mar 11 13:00–14:00 Mar 13 01:00–02:00, 05:00–06:00 Mar 14 02:00–03:00 Mar 15 13:00–14:00 Mar 17 12:00–13:00 Mar 18 13:00–14:00 Mar 20 11:00–14:00 Mar 21 12:00–14:00, 23:00–24:00 Mar 25 12:00–14:00 Mar 26 11:00–13:00 Mar 27 11:00–12:00 Mar 28 12:00–13:00 Mar 29 11:00–13:00 Mar 31 12:00–13:00
April
Apr 1 02:00–03:00 Apr 2 12:00–13:00 Apr 4 12:00–15:00 Apr 5 12:00–13:00 Apr 6 11:00–13:00 Apr 8 12:00–14:00 Apr 9 13:00–15:00 Apr 10 14:00–15:00 Apr 11 14:00–15:00 Apr 14 14:00–15:00 Apr 17 14:00–16:00 Apr 19 13:00–14:00 Apr 20 13:00–15:00 Apr 21 13:00–14:00 Apr 22 12:00–15:00 Apr 23 13:00–14:00 Apr 24 13:00–14:00 Apr 25 12:00–15:00 Apr 26 14:00–15:00 Apr 29 12:00–14:00 Apr 30 14:00–15:00
May
May 2 00:00–02:00, 13:00–14:00 May 3 14:00–15:00 May 5 13:00–16:00 May 7 13:00–15:00 May 8 14:00–16:00 May 9 12:00–15:00 May 13 13:00–15:00 May 16 13:00–15:00 May 18 14:00–16:00 May 19 13:00–15:00 May 22 14:00–16:00 May 24 04:00–05:00, 13:00–15:00 May 28 12:00–14:00 May 29 14:00–16:00 May 30 13:00–14:00
June
Jun 1 14:00–15:00 Jun 2 13:00–14:00 Jun 4 13:00–14:00 Jun 5 15:00–17:00 Jun 9 12:00–15:00 Jun 11 13:00–15:00 Jun 12 13:00–15:00 Jun 13 15:00–16:00 Jun 15 13:00–14:00 Jun 16 13:00–15:00 Jun 18 14:00–17:00 Jun 19 13:00–14:00 Jun 20 14:00–16:00 Jun 21 14:00–16:00 Jun 24 13:00–14:00 Jun 25 13:00–14:00 Jun 26 15:00–17:00 Jun 27 12:00–15:00 Jun 29 13:00–14:00
July
Jul 2 13:00–15:00 Jul 4 14:00–15:00 Jul 5 14:00–16:00 Jul 8 02:00–04:00 Jul 9 15:00–16:00 Jul 10 13:00–14:00 Jul 11 01:00–03:00, 05:00–07:00, 14:00–15:00 Jul 13 12:00–15:00 Jul 17 12:00–13:00 Jul 18 13:00–15:00 Jul 19 12:00–14:00 Jul 22 14:00–15:00 Jul 23 14:00–15:00 Jul 25 02:00–03:00 Jul 27 13:00–15:00 Jul 31 13:00–15:00
August
Aug 1 13:00–14:00 Aug 3 13:00–14:00 Aug 5 13:00–14:00 Aug 7 14:00–15:00 Aug 8 05:00–06:00, 14:00–15:00 Aug 10 14:00–15:00 Aug 12 13:00–17:00 Aug 14 13:00–14:00 Aug 15 13:00–15:00 Aug 16 13:00–15:00 Aug 17 13:00–15:00 Aug 18 13:00–15:00 Aug 21 16:00–18:00 Aug 23 11:00–13:00 Aug 24 15:00–17:00 Aug 27 13:00–15:00 Aug 30 01:00–02:00 Aug 31 04:00–05:00
September
Sep 2 13:00–14:00 Sep 3 13:00–15:00 Sep 6 14:00–16:00 Sep 8 13:00–15:00 Sep 9 13:00–15:00 Sep 10 14:00–16:00 Sep 12 13:00–14:00 Sep 13 04:00–05:00, 13:00–14:00 Sep 14 04:00–05:00 Sep 15 12:00–13:00 Sep 17 12:00–15:00 Sep 18 13:00–15:00 Sep 19 00:00–02:00, 13:00–14:00 Sep 20 13:00–14:00 Sep 21 12:00–14:00 Sep 22 13:00–14:00 Sep 23 13:00–15:00 Sep 25 01:00–02:00, 05:00–07:00 Sep 28 12:00–14:00 Sep 30 12:00–14:00
October
Oct 2 13:00–14:00 Oct 3 00:00–01:00, 06:00–07:00, 14:00–15:00 Oct 5 11:00–13:00 Oct 6 01:00–02:00 Oct 7 01:00–02:00, 13:00–14:00 Oct 8 12:00–14:00 Oct 10 12:00–13:00 Oct 11 12:00–15:00 Oct 13 12:00–13:00 Oct 14 12:00–13:00 Oct 15 12:00–14:00 Oct 17 01:00–02:00, 12:00–14:00 Oct 18 13:00–14:00 Oct 19 12:00–14:00 Oct 20 12:00–14:00 Oct 23 12:00–15:00 Oct 24 12:00–13:00 Oct 25 12:00–13:00 Oct 27 13:00–15:00 Oct 29 12:00–14:00 Oct 30 14:00–15:00 Oct 31 13:00–14:00
November
Nov 1 13:00–15:00 Nov 2 12:00–14:00 Nov 3 12:00–13:00 Nov 5 13:00–15:00, 23:00–24:00 Nov 6 00:00–01:00, 05:00–06:00, 22:00–23:00 Nov 7 02:00–03:00, 12:00–14:00 Nov 8 12:00–13:00 Nov 11 12:00–14:00 Nov 12 12:00–14:00 Nov 13 12:00–14:00 Nov 14 13:00–14:00 Nov 15 12:00–13:00, 23:00–24:00 Nov 16 00:00–01:00, 12:00–14:00 Nov 17 11:00–13:00 Nov 19 12:00–13:00 Nov 20 12:00–13:00 Nov 21 12:00–14:00 Nov 24 03:00–05:00, 12:00–14:00 Nov 26 12:00–14:00 Nov 27 23:00–24:00 Nov 28 00:00–01:00 Nov 30 12:00–14:00
December
Dec 1 12:00–14:00 Dec 4 13:00–14:00 Dec 6 11:00–14:00 Dec 7 12:00–13:00 Dec 8 11:00–12:00 Dec 11 00:00–01:00, 04:00–05:00 Dec 14 13:00–14:00 Dec 18 14:00–15:00 Dec 19 12:00–13:00 Dec 22 13:00–14:00 Dec 23 13:00–14:00 Dec 24 01:00–03:00 Dec 25 12:00–14:00 Dec 27 12:00–14:00 Dec 28 12:00–15:00 Dec 30 14:00–15:00 Dec 31 01:00–02:00