Most often in September, 28 days.
Highest follower count seen that year: 2,174.
January
Jan 5 20:00–24:00 Jan 6 00:00–02:00, 09:00–13:00, 19:00–22:00 Jan 7 07:00–10:00, 16:00–18:00, 20:00–24:00 Jan 8 00:00–02:00, 06:00–12:00, 20:00–23:00 Jan 9 05:00–15:00, 22:00–24:00 Jan 10 00:00–01:00, 09:00–11:00, 15:00–18:00 Jan 11 00:00–04:00, 08:00–14:00, 18:00–20:00 Jan 12 07:00–09:00, 13:00–16:00, 20:00–23:00 Jan 13 06:00–08:00, 15:00–17:00, 20:00–24:00 Jan 14 00:00–01:00, 09:00–10:00, 13:00–15:00, 19:00–24:00 Jan 15 00:00–02:00, 10:00–12:00, 14:00–16:00, 21:00–24:00 Jan 16 00:00–03:00, 12:00–15:00 Jan 17 00:00–03:00, 08:00–15:00 Jan 18 00:00–02:00, 09:00–10:00, 18:00–19:00, 23:00–24:00 Jan 19 00:00–04:00, 08:00–15:00 Jan 20 06:00–08:00, 12:00–15:00 Jan 21 00:00–04:00, 11:00–16:00, 22:00–24:00 Jan 22 10:00–17:00, 20:00–23:00 Jan 23 12:00–18:00, 21:00–22:00 Jan 24 07:00–09:00, 16:00–17:00, 22:00–24:00 Jan 25 15:00–17:00, 19:00–22:00 Jan 26 14:00–17:00, 20:00–24:00 Jan 27 06:00–07:00, 13:00–14:00, 16:00–17:00, 19:00–20:00 Jan 28 00:00–01:00, 08:00–12:00, 15:00–16:00, 19:00–21:00 Jan 29 06:00–10:00, 20:00–23:00 Jan 30 03:00–06:00, 12:00–16:00 Jan 31 02:00–05:00
February
Feb 4 04:00–05:00, 13:00–16:00 Feb 5 00:00–03:00, 09:00–10:00, 14:00–15:00, 19:00–22:00 Feb 6 04:00–11:00, 14:00–15:00 Feb 7 00:00–05:00, 14:00–18:00 Feb 8 00:00–02:00, 07:00–10:00, 15:00–16:00, 19:00–24:00 Feb 9 00:00–05:00, 13:00–15:00, 22:00–24:00 Feb 10 00:00–01:00, 03:00–06:00, 13:00–15:00, 20:00–24:00 Feb 11 01:00–02:00, 13:00–14:00, 20:00–24:00 Feb 12 00:00–01:00 Feb 19 05:00–08:00, 10:00–14:00, 20:00–24:00 Feb 20 06:00–10:00, 14:00–16:00, 19:00–24:00 Feb 21 07:00–09:00, 14:00–17:00 Feb 22 04:00–08:00, 13:00–17:00 Feb 23 02:00–06:00, 08:00–11:00, 19:00–22:00 Feb 24 06:00–09:00, 15:00–19:00 Feb 25 05:00–09:00, 14:00–17:00, 21:00–24:00 Feb 26 08:00–10:00, 14:00–19:00, 22:00–23:00 Feb 27 06:00–08:00, 11:00–13:00 Feb 28 04:00–09:00, 11:00–23:00
March
Mar 1 08:00–10:00, 23:00–24:00 Mar 2 01:00–02:00, 09:00–11:00, 17:00–18:00, 21:00–24:00 Mar 3 00:00–04:00, 11:00–14:00, 22:00–24:00 Mar 4 08:00–10:00 Mar 5 12:00–13:00, 21:00–22:00 Mar 6 19:00–22:00 Mar 7 04:00–06:00 Mar 14 15:00–21:00 Mar 15 07:00–08:00 Mar 16 07:00–09:00 Mar 17 07:00–10:00, 14:00–16:00, 19:00–23:00 Mar 18 05:00–08:00, 13:00–16:00, 20:00–24:00 Mar 19 10:00–13:00, 18:00–21:00 Mar 20 07:00–11:00, 15:00–16:00 Mar 21 14:00–16:00, 19:00–24:00 Mar 22 09:00–10:00, 14:00–16:00 Mar 23 14:00–16:00, 18:00–23:00 Mar 24 07:00–12:00, 16:00–18:00 Mar 25 07:00–08:00, 10:00–11:00, 13:00–15:00, 20:00–24:00 Mar 26 13:00–15:00, 22:00–24:00 Mar 27 00:00–01:00, 21:00–24:00 Mar 28 00:00–01:00, 09:00–10:00, 18:00–22:00 Mar 29 08:00–09:00, 13:00–16:00, 22:00–24:00 Mar 30 00:00–01:00, 13:00–15:00, 19:00–21:00 Mar 31 06:00–08:00, 14:00–15:00, 20:00–24:00
April
Apr 1 10:00–11:00, 18:00–24:00 Apr 2 12:00–14:00 Apr 4 07:00–10:00, 20:00–21:00 Apr 5 00:00–01:00, 17:00–19:00 Apr 6 05:00–06:00 Apr 8 20:00–22:00 Apr 9 13:00–14:00, 22:00–23:00 Apr 10 05:00–06:00, 14:00–17:00, 19:00–22:00 Apr 11 00:00–02:00, 14:00–18:00 Apr 12 05:00–08:00 Apr 13 04:00–08:00, 20:00–22:00 Apr 14 05:00–06:00, 23:00–24:00 Apr 15 00:00–04:00, 20:00–22:00 Apr 16 14:00–16:00, 20:00–21:00 Apr 17 05:00–07:00, 16:00–18:00 Apr 18 04:00–08:00, 14:00–17:00 Apr 20 18:00–22:00 Apr 21 14:00–16:00, 21:00–23:00 Apr 22 19:00–22:00 Apr 23 11:00–14:00, 20:00–23:00 Apr 24 06:00–13:00 Apr 25 04:00–10:00 Apr 26 04:00–05:00, 23:00–24:00 Apr 27 00:00–02:00, 14:00–15:00, 22:00–24:00 Apr 28 09:00–12:00, 21:00–24:00 Apr 29 14:00–15:00, 19:00–21:00 Apr 30 20:00–24:00
May
May 2 15:00–17:00 May 3 20:00–22:00 May 4 05:00–07:00 May 5 16:00–17:00 May 7 17:00–19:00 May 8 13:00–17:00, 20:00–23:00 May 9 12:00–15:00 May 10 09:00–10:00, 14:00–16:00 May 11 15:00–16:00, 20:00–21:00 May 13 17:00–21:00 May 14 06:00–08:00 May 15 20:00–21:00 May 16 07:00–08:00, 11:00–13:00 May 17 06:00–08:00 May 21 06:00–08:00 May 25 19:00–21:00 May 26 04:00–05:00, 08:00–09:00 May 28 07:00–08:00 May 30 04:00–06:00
June
Jun 4 04:00–06:00, 17:00–19:00 Jun 5 07:00–08:00 Jun 16 05:00–06:00, 11:00–14:00 Jun 17 05:00–06:00 Jun 18 04:00–08:00 Jun 20 05:00–07:00 Jun 22 04:00–06:00 Jun 23 04:00–07:00, 09:00–10:00 Jun 24 20:00–23:00 Jun 26 11:00–12:00 Jun 27 04:00–06:00 Jun 29 04:00–07:00 Jun 30 10:00–11:00
July
Jul 2 05:00–08:00 Jul 7 17:00–18:00 Jul 8 04:00–06:00, 18:00–20:00 Jul 9 05:00–07:00 Jul 11 04:00–08:00, 12:00–14:00 Jul 12 00:00–03:00, 10:00–12:00, 17:00–18:00 Jul 13 04:00–07:00, 17:00–18:00 Jul 14 01:00–05:00 Jul 29 08:00–11:00, 23:00–24:00 Jul 30 15:00–18:00 Jul 31 06:00–07:00
August
Aug 5 07:00–08:00, 18:00–19:00 Aug 7 21:00–22:00 Aug 8 10:00–13:00 Aug 10 05:00–06:00 Aug 11 05:00–08:00, 20:00–22:00 Aug 12 03:00–04:00 Aug 13 08:00–09:00 Aug 14 09:00–11:00 Aug 15 03:00–05:00, 18:00–20:00 Aug 16 05:00–08:00, 20:00–21:00 Aug 17 06:00–09:00, 14:00–15:00, 19:00–20:00 Aug 18 23:00–24:00 Aug 19 13:00–16:00 Aug 20 03:00–05:00, 13:00–14:00 Aug 21 03:00–05:00, 16:00–17:00 Aug 25 05:00–08:00, 11:00–13:00 Aug 26 13:00–15:00, 23:00–24:00 Aug 27 06:00–07:00, 13:00–15:00, 22:00–23:00 Aug 28 00:00–02:00 Aug 29 18:00–24:00 Aug 30 17:00–19:00 Aug 31 04:00–05:00
September
Sep 1 22:00–24:00 Sep 2 00:00–01:00, 14:00–16:00, 21:00–24:00 Sep 3 13:00–14:00 Sep 6 03:00–05:00, 18:00–24:00 Sep 7 00:00–01:00, 06:00–07:00 Sep 8 08:00–10:00, 18:00–19:00, 23:00–24:00 Sep 9 04:00–06:00, 12:00–15:00 Sep 10 03:00–07:00, 20:00–22:00 Sep 11 12:00–13:00 Sep 12 16:00–19:00, 21:00–22:00 Sep 13 03:00–06:00 Sep 14 11:00–13:00 Sep 15 16:00–18:00, 23:00–24:00 Sep 16 00:00–02:00, 13:00–14:00, 16:00–17:00, 22:00–24:00 Sep 17 00:00–01:00 Sep 18 03:00–05:00 Sep 19 09:00–11:00, 21:00–23:00 Sep 20 03:00–05:00, 11:00–14:00 Sep 21 05:00–07:00, 12:00–14:00, 22:00–24:00 Sep 22 00:00–06:00, 11:00–14:00 Sep 23 03:00–06:00, 17:00–19:00 Sep 24 08:00–10:00, 18:00–23:00 Sep 25 03:00–04:00, 16:00–18:00 Sep 26 01:00–04:00, 11:00–12:00, 19:00–21:00 Sep 27 05:00–07:00, 11:00–12:00 Sep 28 06:00–08:00, 11:00–12:00 Sep 29 19:00–22:00 Sep 30 06:00–09:00, 21:00–24:00
October
Oct 3 13:00–16:00 Oct 4 13:00–15:00 Oct 5 12:00–15:00
November
Nov 1 17:00–18:00 Nov 2 06:00–07:00 Nov 3 12:00–14:00 Nov 8 12:00–14:00 Nov 9 17:00–21:00 Nov 10 14:00–17:00, 19:00–20:00 Nov 11 04:00–07:00 Nov 12 06:00–08:00, 10:00–11:00, 13:00–15:00, 18:00–20:00 Nov 13 06:00–07:00 Nov 14 07:00–09:00, 14:00–17:00 Nov 15 05:00–08:00, 14:00–16:00, 18:00–20:00 Nov 16 05:00–06:00, 15:00–16:00 Nov 17 04:00–06:00 Nov 20 05:00–06:00, 10:00–13:00 Nov 21 06:00–07:00 Nov 22 05:00–07:00, 14:00–15:00, 19:00–20:00 Nov 24 03:00–04:00 Nov 26 05:00–06:00, 11:00–12:00 Nov 27 16:00–17:00 Nov 28 05:00–07:00, 13:00–14:00
December
Dec 1 18:00–20:00 Dec 2 14:00–15:00 Dec 3 10:00–13:00, 22:00–24:00 Dec 4 07:00–08:00 Dec 5 12:00–13:00 Dec 9 04:00–07:00 Dec 10 06:00–07:00 Dec 11 03:00–05:00, 13:00–15:00 Dec 12 01:00–06:00, 14:00–15:00 Dec 13 04:00–06:00 Dec 14 04:00–08:00 Dec 15 06:00–08:00 Dec 19 10:00–14:00 Dec 25 01:00–04:00 Dec 26 04:00–06:00 Dec 29 07:00–08:00 Dec 30 05:00–07:00