Most often in December, 25 days.
Highest follower count seen that year: 18,478.
January
Jan 2 07:00–16:00 Jan 3 07:00–13:00 Jan 6 08:00–14:00 Jan 7 07:00–15:00 Jan 8 07:00–14:00 Jan 9 09:00–14:00 Jan 10 09:00–17:00 Jan 11 07:00–14:00 Jan 13 06:00–13:00 Jan 14 06:00–13:00 Jan 15 06:00–13:00 Jan 18 18:00–24:00 Jan 19 00:00–01:00 Jan 21 18:00–24:00 Jan 22 00:00–03:00, 19:00–24:00 Jan 23 00:00–01:00 Jan 24 07:00–10:00, 15:00–17:00 Jan 27 06:00–15:00 Jan 28 06:00–16:00 Jan 29 07:00–16:00 Jan 30 08:00–14:00 Jan 31 07:00–15:00
February
Feb 3 07:00–15:00 Feb 4 07:00–14:00 Feb 5 06:00–15:00 Feb 6 07:00–15:00 Feb 7 07:00–13:00 Feb 10 06:00–17:00 Feb 11 07:00–14:00 Feb 12 07:00–15:00 Feb 13 06:00–13:00 Feb 14 07:00–14:00 Feb 16 05:00–13:00 Feb 17 05:00–16:00 Feb 18 05:00–13:00 Feb 19 06:00–15:00 Feb 22 06:00–16:00 Feb 23 05:00–14:00 Feb 24 08:00–17:00 Feb 25 05:00–13:00 Feb 26 06:00–14:00 Feb 28 05:00–16:00
March
Mar 1 06:00–13:00 Mar 3 06:00–14:00 Mar 4 06:00–17:00 Mar 5 06:00–13:00 Mar 6 05:00–15:00 Mar 8 05:00–13:00 Mar 10 07:00–14:00 Mar 11 05:00–11:00 Mar 12 05:00–14:00 Mar 13 06:00–14:00 Mar 15 05:00–14:00 Mar 17 08:00–15:00 Mar 19 06:00–17:00 Mar 20 06:00–15:00 Mar 23 06:00–18:00 Mar 24 06:00–17:00 Mar 25 06:00–14:00 Mar 26 06:00–14:00 Mar 27 06:00–19:00 Mar 29 06:00–15:00 Mar 30 05:00–15:00 Mar 31 05:00–16:00
April
Apr 1 06:00–15:00 Apr 3 05:00–17:00 Apr 4 05:00–12:00 Apr 6 06:00–14:00 Apr 7 06:00–07:00, 09:00–13:00 Apr 9 05:00–12:00 Apr 10 05:00–13:00 Apr 11 05:00–13:00 Apr 12 06:00–14:00 Apr 14 06:00–14:00 Apr 15 05:00–11:00 Apr 16 05:00–12:00 Apr 17 05:00–13:00 Apr 18 05:00–12:00 Apr 19 06:00–07:00, 09:00–13:00 Apr 23 05:00–13:00 Apr 24 05:00–14:00 Apr 25 05:00–12:00 Apr 26 05:00–14:00 Apr 27 07:00–11:00 Apr 28 09:00–13:00 Apr 29 06:00–14:00 Apr 30 06:00–13:00
May
May 3 20:00–24:00 May 4 19:00–23:00 May 6 05:00–13:00 May 7 05:00–12:00 May 8 05:00–13:00 May 9 05:00–13:00 May 12 06:00–12:00 May 13 06:00–11:00 May 15 08:00–13:00 May 16 05:00–14:00 May 17 06:00–13:00 May 22 07:00–14:00 May 23 08:00–14:00 May 24 06:00–12:00 May 25 06:00–15:00 May 26 07:00–12:00 May 27 05:00–11:00 May 28 06:00–14:00 May 29 05:00–13:00 May 30 05:00–14:00 May 31 05:00–14:00
June
Jun 1 06:00–14:00 Jun 2 11:00–13:00 Jun 3 06:00–12:00 Jun 4 06:00–13:00 Jun 5 06:00–13:00 Jun 8 06:00–14:00 Jun 9 05:00–14:00 Jun 10 06:00–14:00 Jun 11 06:00–14:00 Jun 12 06:00–12:00 Jun 13 06:00–16:00 Jun 16 05:00–14:00 Jun 17 06:00–13:00 Jun 18 07:00–11:00 Jun 19 06:00–13:00 Jun 21 05:00–14:00 Jun 23 06:00–14:00 Jun 24 06:00–13:00 Jun 25 05:00–15:00 Jun 26 06:00–14:00 Jun 29 18:00–24:00 Jun 30 00:00–02:00, 19:00–24:00
July
Jul 1 00:00–03:00 Jul 2 05:00–14:00 Jul 3 06:00–14:00 Jul 5 05:00–12:00 Jul 6 06:00–13:00 Jul 7 06:00–11:00 Jul 8 06:00–12:00 Jul 9 06:00–15:00 Jul 12 05:00–13:00 Jul 13 06:00–14:00 Jul 14 10:00–12:00 Jul 16 07:00–15:00 Jul 17 06:00–12:00 Jul 18 09:00–14:00 Jul 22 19:00–24:00 Jul 23 00:00–03:00, 21:00–24:00 Jul 24 00:00–04:00, 20:00–24:00 Jul 25 20:00–24:00 Jul 26 00:00–04:00, 19:00–24:00 Jul 27 00:00–03:00 Jul 29 19:00–24:00 Jul 30 01:00–02:00, 20:00–24:00 Jul 31 00:00–04:00
August
Aug 1 06:00–15:00 Aug 2 05:00–13:00 Aug 3 06:00–13:00 Aug 4 05:00–12:00 Aug 5 06:00–12:00 Aug 7 05:00–10:00 Aug 8 04:00–08:00 Aug 11 06:00–12:00 Aug 12 06:00–13:00 Aug 13 06:00–13:00 Aug 14 05:00–13:00 Aug 15 06:00–14:00 Aug 16 04:00–05:00, 07:00–14:00 Aug 18 06:00–13:00 Aug 19 06:00–14:00 Aug 20 06:00–13:00 Aug 21 07:00–14:00 Aug 22 06:00–12:00 Aug 23 06:00–12:00
October
Oct 13 20:00–24:00 Oct 14 00:00–05:00, 18:00–24:00 Oct 15 00:00–02:00, 18:00–24:00 Oct 16 00:00–02:00, 18:00–24:00 Oct 17 00:00–01:00 Oct 19 17:00–24:00 Oct 20 00:00–02:00, 18:00–24:00 Oct 21 00:00–01:00 Oct 22 04:00–10:00 Oct 28 07:00–14:00 Oct 29 07:00–15:00 Oct 30 06:00–15:00 Oct 31 06:00–14:00
November
Nov 1 06:00–12:00 Nov 3 06:00–13:00 Nov 4 06:00–15:00 Nov 5 06:00–10:00 Nov 6 06:00–14:00 Nov 7 07:00–15:00 Nov 12 07:00–13:00 Nov 13 07:00–16:00 Nov 14 07:00–16:00 Nov 16 06:00–15:00 Nov 17 06:00–15:00 Nov 18 06:00–14:00 Nov 19 06:00–16:00 Nov 20 06:00–15:00 Nov 21 07:00–15:00 Nov 22 07:00–10:00 Nov 24 07:00–15:00 Nov 25 07:00–10:00 Nov 26 11:00–16:00 Nov 27 07:00–12:00 Nov 28 08:00–15:00 Nov 30 07:00–15:00
December
Dec 1 20:00–24:00 Dec 2 00:00–05:00 Dec 3 06:00–14:00 Dec 4 07:00–15:00 Dec 5 07:00–15:00 Dec 6 07:00–16:00 Dec 7 08:00–16:00 Dec 10 07:00–12:00 Dec 12 06:00–14:00 Dec 13 07:00–14:00 Dec 14 08:00–17:00 Dec 16 10:00–13:00 Dec 17 07:00–14:00 Dec 18 07:00–15:00 Dec 19 07:00–14:00 Dec 20 07:00–13:00 Dec 22 21:00–24:00 Dec 23 00:00–03:00, 19:00–24:00 Dec 24 00:00–04:00, 20:00–24:00 Dec 25 00:00–06:00, 21:00–24:00 Dec 26 00:00–05:00, 21:00–24:00 Dec 27 00:00–05:00 Dec 29 20:00–24:00 Dec 30 00:00–05:00, 20:00–24:00 Dec 31 00:00–05:00