Most often in September, 23 days.
Highest follower count seen that year: 12,359.
January
Jan 2 10:00–14:00 Jan 3 09:00–10:00 Jan 4 15:00–16:00 Jan 6 11:00–12:00, 15:00–17:00 Jan 8 14:00–15:00 Jan 9 11:00–13:00 Jan 11 15:00–17:00 Jan 13 10:00–11:00 Jan 15 07:00–09:00 Jan 16 22:00–24:00 Jan 20 07:00–13:00, 15:00–17:00 Jan 21 08:00–09:00, 14:00–15:00 Jan 26 14:00–16:00 Jan 27 07:00–10:00 Jan 28 10:00–12:00 Jan 29 07:00–08:00, 13:00–15:00 Jan 31 07:00–10:00
February
Feb 2 00:00–01:00 Feb 3 23:00–24:00 Feb 4 08:00–09:00 Feb 6 00:00–01:00 Feb 8 07:00–08:00, 22:00–23:00 Feb 9 19:00–20:00 Feb 10 09:00–12:00 Feb 11 09:00–15:00 Feb 12 09:00–13:00 Feb 13 08:00–12:00, 17:00–19:00 Feb 14 11:00–13:00 Feb 17 06:00–12:00 Feb 20 10:00–12:00 Feb 21 07:00–08:00, 14:00–17:00, 23:00–24:00 Feb 22 00:00–01:00, 12:00–14:00 Feb 24 00:00–01:00, 10:00–16:00 Feb 25 07:00–09:00, 12:00–15:00, 22:00–24:00 Feb 26 09:00–16:00 Feb 27 09:00–11:00, 14:00–17:00 Feb 28 09:00–11:00, 13:00–15:00, 23:00–24:00
March
Mar 3 13:00–15:00 Mar 4 09:00–12:00, 15:00–17:00 Mar 5 07:00–10:00, 12:00–14:00 Mar 6 09:00–11:00, 16:00–18:00 Mar 10 12:00–15:00 Mar 11 09:00–10:00, 14:00–15:00 Mar 14 11:00–14:00, 22:00–24:00 Mar 15 10:00–12:00 Mar 17 10:00–11:00 Mar 18 08:00–09:00, 11:00–12:00, 22:00–23:00 Mar 19 09:00–10:00 Mar 20 09:00–11:00 Mar 21 10:00–11:00 Mar 23 11:00–13:00, 16:00–18:00 Mar 24 07:00–09:00, 13:00–18:00, 20:00–21:00 Mar 25 08:00–10:00 Mar 26 07:00–09:00, 23:00–24:00 Mar 27 16:00–20:00, 22:00–24:00 Mar 28 00:00–03:00, 09:00–10:00 Mar 29 12:00–13:00, 16:00–19:00 Mar 30 12:00–14:00 Mar 31 10:00–13:00, 17:00–19:00, 21:00–23:00
April
Apr 1 08:00–09:00, 13:00–15:00 Apr 2 16:00–17:00 Apr 3 09:00–12:00 Apr 4 06:00–14:00 Apr 5 08:00–13:00 Apr 6 14:00–15:00 Apr 7 09:00–11:00, 13:00–15:00 Apr 8 10:00–11:00, 14:00–15:00 Apr 11 09:00–17:00 Apr 15 06:00–08:00 Apr 17 10:00–11:00 Apr 18 22:00–23:00 Apr 21 09:00–10:00, 22:00–24:00 Apr 22 11:00–13:00 Apr 23 05:00–07:00, 12:00–14:00 Apr 24 20:00–21:00 Apr 28 07:00–11:00 Apr 29 06:00–11:00, 15:00–17:00 Apr 30 08:00–10:00
May
May 2 07:00–14:00 May 4 10:00–12:00, 18:00–20:00 May 5 07:00–08:00 May 6 22:00–24:00 May 8 09:00–12:00 May 9 06:00–09:00 May 13 06:00–07:00, 16:00–17:00, 22:00–24:00 May 14 23:00–24:00 May 15 10:00–11:00 May 17 00:00–01:00, 06:00–07:00 May 18 14:00–16:00 May 19 02:00–04:00, 14:00–15:00, 21:00–23:00 May 20 07:00–09:00 May 22 13:00–15:00, 17:00–19:00 May 23 09:00–11:00, 15:00–16:00 May 24 23:00–24:00 May 25 12:00–15:00 May 26 07:00–08:00 May 27 10:00–12:00, 21:00–23:00 May 28 22:00–23:00 May 30 12:00–14:00
June
Jun 1 11:00–15:00 Jun 2 08:00–09:00, 11:00–14:00 Jun 3 23:00–24:00 Jun 9 10:00–12:00 Jun 10 09:00–10:00 Jun 11 15:00–16:00 Jun 12 08:00–10:00 Jun 15 10:00–12:00, 23:00–24:00 Jun 16 05:00–07:00, 09:00–10:00 Jun 23 01:00–03:00, 09:00–12:00 Jun 24 10:00–14:00, 16:00–19:00, 23:00–24:00 Jun 25 00:00–01:00, 11:00–12:00, 23:00–24:00 Jun 26 07:00–10:00 Jun 29 11:00–13:00, 22:00–23:00 Jun 30 09:00–13:00, 23:00–24:00
July
Jul 1 09:00–11:00 Jul 2 10:00–15:00 Jul 3 11:00–12:00 Jul 4 10:00–15:00 Jul 7 23:00–24:00 Jul 8 22:00–24:00 Jul 9 23:00–24:00 Jul 10 00:00–01:00 Jul 11 07:00–08:00 Jul 14 10:00–12:00, 14:00–15:00 Jul 15 11:00–13:00, 17:00–19:00, 23:00–24:00 Jul 16 01:00–02:00, 10:00–11:00 Jul 20 16:00–17:00 Jul 21 09:00–11:00 Jul 22 06:00–07:00, 16:00–18:00, 22:00–24:00 Jul 23 09:00–11:00, 22:00–24:00 Jul 24 05:00–07:00, 10:00–11:00 Jul 25 08:00–10:00 Jul 26 08:00–10:00 Jul 28 07:00–09:00, 12:00–16:00, 19:00–20:00 Jul 29 01:00–04:00, 10:00–12:00 Jul 31 13:00–16:00
August
Aug 1 06:00–09:00, 14:00–15:00 Aug 2 10:00–12:00 Aug 4 04:00–07:00, 09:00–10:00, 12:00–14:00 Aug 5 11:00–13:00 Aug 6 12:00–17:00 Aug 7 08:00–09:00, 11:00–15:00 Aug 8 09:00–10:00 Aug 9 12:00–13:00 Aug 10 10:00–11:00, 22:00–23:00 Aug 11 11:00–16:00 Aug 12 06:00–08:00 Aug 14 07:00–08:00, 15:00–16:00 Aug 15 12:00–14:00 Aug 16 13:00–14:00 Aug 18 12:00–13:00, 17:00–18:00 Aug 21 13:00–14:00 Aug 22 05:00–07:00 Aug 24 14:00–17:00, 21:00–22:00 Aug 25 08:00–09:00, 14:00–15:00 Aug 27 09:00–11:00 Aug 28 06:00–07:00, 10:00–12:00, 18:00–19:00 Aug 29 14:00–15:00
September
Sep 1 09:00–14:00 Sep 2 23:00–24:00 Sep 3 00:00–01:00, 10:00–11:00, 13:00–15:00, 20:00–21:00 Sep 4 06:00–09:00, 12:00–15:00 Sep 6 08:00–09:00, 15:00–16:00 Sep 7 02:00–03:00, 21:00–23:00 Sep 8 08:00–10:00, 19:00–21:00 Sep 9 07:00–08:00 Sep 13 09:00–10:00, 15:00–16:00 Sep 14 11:00–13:00 Sep 15 13:00–14:00 Sep 16 08:00–12:00 Sep 17 08:00–09:00, 17:00–18:00 Sep 20 08:00–09:00 Sep 21 17:00–18:00, 23:00–24:00 Sep 22 00:00–01:00, 07:00–12:00, 15:00–17:00, 21:00–22:00 Sep 23 09:00–12:00, 16:00–17:00 Sep 24 12:00–14:00 Sep 25 12:00–14:00, 20:00–22:00 Sep 26 10:00–11:00 Sep 27 10:00–12:00 Sep 29 08:00–10:00, 23:00–24:00 Sep 30 10:00–13:00
October
Oct 1 09:00–10:00, 13:00–15:00 Oct 2 11:00–12:00 Oct 4 10:00–12:00 Oct 5 12:00–13:00 Oct 6 08:00–09:00, 11:00–15:00 Oct 7 07:00–09:00, 12:00–13:00 Oct 8 11:00–13:00 Oct 13 06:00–09:00 Oct 15 13:00–15:00 Oct 18 15:00–16:00 Oct 19 12:00–14:00, 19:00–20:00 Oct 20 13:00–15:00 Oct 21 08:00–10:00 Oct 22 12:00–14:00 Oct 24 14:00–16:00, 22:00–24:00 Oct 26 16:00–18:00 Oct 27 07:00–10:00 Oct 30 00:00–01:00, 13:00–14:00
November
Nov 6 10:00–11:00 Nov 9 23:00–24:00 Nov 10 11:00–13:00 Nov 11 10:00–14:00 Nov 12 10:00–12:00, 15:00–17:00 Nov 13 17:00–18:00 Nov 14 12:00–13:00, 21:00–23:00 Nov 16 17:00–18:00, 21:00–22:00 Nov 17 09:00–11:00, 17:00–18:00 Nov 19 11:00–12:00 Nov 22 17:00–19:00, 23:00–24:00 Nov 23 00:00–01:00, 12:00–15:00 Nov 24 14:00–15:00 Nov 25 09:00–11:00 Nov 27 08:00–10:00 Nov 28 15:00–17:00 Nov 29 11:00–12:00, 17:00–18:00 Nov 30 08:00–10:00, 13:00–15:00
December
Dec 1 09:00–10:00 Dec 2 10:00–12:00 Dec 3 00:00–01:00, 09:00–11:00, 22:00–24:00 Dec 4 08:00–11:00 Dec 5 16:00–17:00 Dec 6 01:00–02:00, 12:00–14:00 Dec 7 14:00–16:00, 19:00–21:00 Dec 8 12:00–13:00 Dec 12 17:00–19:00, 23:00–24:00 Dec 13 00:00–01:00 Dec 18 08:00–09:00 Dec 21 12:00–13:00, 23:00–24:00 Dec 22 00:00–01:00, 14:00–17:00 Dec 23 00:00–02:00 Dec 24 01:00–03:00, 11:00–12:00 Dec 25 11:00–14:00, 17:00–19:00 Dec 26 20:00–22:00 Dec 29 14:00–16:00, 18:00–20:00 Dec 30 08:00–10:00, 17:00–18:00 Dec 31 14:00–15:00