Most often in January, 23 days.
Highest follower count seen that year: 3,115.
January
Jan 1 10:00–17:00 Jan 2 17:00–20:00 Jan 3 14:00–18:00 Jan 4 17:00–20:00 Jan 5 11:00–14:00 Jan 6 13:00–16:00 Jan 7 08:00–09:00, 14:00–15:00 Jan 8 15:00–18:00 Jan 9 14:00–15:00 Jan 11 08:00–11:00 Jan 12 11:00–12:00 Jan 14 10:00–12:00, 16:00–18:00 Jan 15 18:00–21:00 Jan 21 10:00–12:00, 14:00–16:00 Jan 22 07:00–10:00, 17:00–20:00 Jan 23 10:00–13:00, 16:00–19:00 Jan 24 08:00–10:00, 19:00–20:00 Jan 26 17:00–22:00 Jan 27 18:00–21:00 Jan 28 13:00–21:00 Jan 29 12:00–15:00, 17:00–20:00 Jan 30 08:00–09:00, 18:00–20:00 Jan 31 10:00–12:00, 14:00–18:00
February
Feb 1 03:00–05:00, 17:00–19:00 Feb 2 13:00–17:00 Feb 3 13:00–16:00 Feb 4 04:00–07:00, 13:00–16:00 Feb 5 14:00–19:00 Feb 6 08:00–11:00, 15:00–17:00 Feb 7 06:00–09:00 Feb 8 08:00–09:00, 17:00–20:00 Feb 9 19:00–22:00 Feb 10 18:00–21:00 Feb 11 12:00–15:00 Feb 12 07:00–10:00 Feb 18 11:00–14:00, 18:00–21:00 Feb 19 13:00–16:00 Feb 20 04:00–07:00, 13:00–15:00 Feb 21 14:00–18:00 Feb 23 13:00–17:00 Feb 24 13:00–17:00 Feb 25 08:00–10:00, 13:00–16:00 Feb 26 06:00–08:00 Feb 27 03:00–05:00, 15:00–19:00 Feb 28 03:00–06:00, 18:00–21:00
March
Mar 3 16:00–20:00 Mar 5 18:00–19:00 Mar 7 04:00–05:00 Mar 9 16:00–19:00 Mar 11 04:00–06:00, 16:00–19:00 Mar 13 04:00–09:00 Mar 14 19:00–21:00 Mar 15 19:00–21:00 Mar 18 06:00–08:00, 17:00–19:00 Mar 19 12:00–15:00 Mar 20 06:00–08:00, 14:00–17:00 Mar 21 04:00–06:00 Mar 22 05:00–08:00, 15:00–18:00 Mar 23 14:00–17:00 Mar 24 12:00–14:00 Mar 26 04:00–06:00 Mar 27 06:00–09:00, 15:00–18:00 Mar 28 14:00–16:00 Mar 31 04:00–06:00
April
Apr 1 03:00–05:00 Apr 2 12:00–15:00 Apr 3 03:00–07:00, 12:00–14:00 Apr 5 04:00–07:00 Apr 6 08:00–10:00 Apr 7 04:00–08:00 Apr 8 04:00–07:00, 12:00–14:00 Apr 9 04:00–06:00 Apr 10 04:00–06:00 Apr 15 04:00–07:00 Apr 16 04:00–07:00 Apr 17 05:00–08:00 Apr 19 03:00–04:00, 06:00–07:00 Apr 21 06:00–08:00 Apr 22 05:00–08:00, 17:00–20:00 Apr 24 05:00–07:00, 15:00–17:00 Apr 28 19:00–22:00 Apr 29 09:00–11:00
May
May 2 07:00–12:00 May 4 15:00–17:00 May 6 08:00–11:00, 16:00–20:00 May 7 14:00–16:00 May 11 17:00–20:00 May 13 13:00–17:00 May 14 05:00–07:00 May 15 04:00–07:00 May 20 04:00–06:00 May 21 05:00–06:00 May 22 14:00–16:00 May 24 03:00–06:00 May 25 15:00–18:00 May 28 13:00–16:00 May 30 05:00–07:00 May 31 04:00–07:00
June
Jun 1 05:00–07:00, 14:00–17:00 Jun 2 17:00–20:00 Jun 3 12:00–15:00 Jun 4 04:00–06:00 Jun 5 04:00–07:00, 11:00–16:00 Jun 7 15:00–19:00 Jun 8 05:00–07:00 Jun 9 15:00–19:00 Jun 10 11:00–15:00 Jun 12 06:00–08:00 Jun 13 13:00–15:00 Jun 14 03:00–07:00 Jun 15 07:00–09:00 Jun 16 04:00–05:00 Jun 20 06:00–09:00 Jun 21 03:00–07:00 Jun 23 12:00–14:00 Jun 24 14:00–16:00 Jun 25 12:00–14:00 Jun 26 04:00–06:00 Jun 28 14:00–17:00 Jun 30 11:00–14:00
July
Jul 1 03:00–07:00 Jul 3 04:00–07:00, 16:00–21:00 Jul 4 16:00–21:00 Jul 6 15:00–17:00 Jul 8 03:00–08:00 Jul 10 05:00–10:00 Jul 12 06:00–08:00, 15:00–16:00 Jul 15 06:00–08:00, 14:00–17:00 Jul 22 14:00–18:00 Jul 23 13:00–17:00 Jul 24 15:00–17:00 Jul 25 08:00–12:00 Jul 26 15:00–19:00 Jul 29 03:00–06:00, 11:00–15:00 Jul 31 06:00–08:00, 11:00–12:00, 14:00–17:00
August
Aug 1 03:00–06:00 Aug 2 04:00–07:00, 13:00–15:00 Aug 3 15:00–21:00 Aug 6 11:00–13:00 Aug 7 05:00–08:00 Aug 9 04:00–07:00 Aug 10 06:00–09:00 Aug 11 03:00–06:00 Aug 12 08:00–10:00 Aug 13 18:00–21:00 Aug 15 02:00–04:00 Aug 16 05:00–06:00 Aug 19 06:00–09:00 Aug 20 04:00–06:00, 12:00–14:00 Aug 21 06:00–08:00 Aug 23 04:00–06:00 Aug 28 08:00–10:00 Aug 30 05:00–08:00, 16:00–20:00 Aug 31 14:00–18:00
September
Sep 1 04:00–06:00 Sep 2 15:00–17:00 Sep 7 05:00–08:00, 16:00–19:00 Sep 8 14:00–19:00 Sep 10 03:00–05:00 Sep 11 04:00–08:00 Sep 13 07:00–09:00, 12:00–14:00 Sep 15 03:00–06:00, 14:00–17:00 Sep 16 06:00–08:00, 15:00–18:00 Sep 18 04:00–07:00 Sep 20 16:00–18:00 Sep 24 14:00–18:00 Sep 26 15:00–18:00 Sep 28 16:00–19:00 Sep 30 07:00–10:00
October
Oct 1 03:00–06:00 Oct 2 04:00–06:00 Oct 3 03:00–06:00 Oct 4 03:00–08:00 Oct 5 05:00–08:00 Oct 6 15:00–19:00 Oct 7 05:00–08:00 Oct 8 14:00–18:00 Oct 9 04:00–06:00 Oct 10 03:00–06:00 Oct 11 16:00–19:00 Oct 13 04:00–07:00 Oct 14 04:00–07:00 Oct 16 03:00–07:00 Oct 17 03:00–06:00 Oct 19 04:00–07:00 Oct 20 15:00–18:00 Oct 22 03:00–06:00 Oct 26 15:00–18:00 Oct 28 06:00–08:00 Oct 29 17:00–20:00 Oct 30 16:00–19:00
November
Nov 2 16:00–18:00 Nov 4 06:00–09:00, 17:00–20:00 Nov 6 15:00–18:00 Nov 9 17:00–20:00 Nov 14 03:00–04:00 Nov 16 03:00–07:00 Nov 18 04:00–07:00 Nov 21 04:00–06:00 Nov 22 04:00–08:00 Nov 26 18:00–19:00 Nov 27 10:00–12:00 Nov 28 17:00–19:00 Nov 29 17:00–19:00 Nov 30 17:00–20:00
December
Dec 1 05:00–06:00 Dec 3 03:00–05:00 Dec 4 07:00–09:00, 15:00–19:00 Dec 6 16:00–19:00 Dec 7 16:00–19:00 Dec 9 15:00–20:00 Dec 11 08:00–12:00, 16:00–19:00 Dec 14 16:00–19:00 Dec 16 04:00–07:00 Dec 17 17:00–22:00 Dec 20 05:00–07:00 Dec 23 18:00–20:00 Dec 26 16:00–19:00 Dec 27 16:00–19:00 Dec 28 15:00–18:00 Dec 30 04:00–08:00 Dec 31 04:00–06:00