Most often in July, 22 days.
Highest follower count seen that year: 30,290.
January
Jan 4 09:00–10:00 Jan 6 04:00–09:00, 22:00–23:00 Jan 7 00:00–02:00, 04:00–06:00 Jan 8 03:00–04:00, 06:00–08:00 Jan 9 07:00–09:00 Jan 13 02:00–03:00, 06:00–08:00 Jan 14 04:00–05:00 Jan 15 00:00–01:00, 20:00–22:00 Jan 20 04:00–06:00, 08:00–09:00 Jan 21 01:00–03:00, 07:00–09:00 Jan 22 00:00–08:00 Jan 23 02:00–03:00, 06:00–09:00 Jan 28 05:00–07:00 Jan 29 06:00–08:00
February
Feb 3 04:00–05:00, 23:00–24:00 Feb 4 05:00–08:00 Feb 5 02:00–03:00 Feb 6 21:00–22:00 Feb 7 21:00–22:00 Feb 10 05:00–06:00 Feb 11 04:00–05:00, 19:00–21:00 Feb 12 01:00–02:00, 05:00–07:00 Feb 17 05:00–07:00 Feb 18 04:00–06:00 Feb 19 03:00–06:00 Feb 21 06:00–07:00
March
Mar 3 03:00–05:00 Mar 4 05:00–07:00, 19:00–20:00 Mar 5 20:00–21:00 Mar 6 19:00–20:00 Mar 10 03:00–04:00, 20:00–21:00 Mar 12 19:00–20:00 Mar 13 20:00–22:00 Mar 14 20:00–21:00 Mar 15 09:00–10:00, 19:00–21:00 Mar 16 19:00–20:00 Mar 17 06:00–07:00, 22:00–23:00 Mar 19 03:00–04:00, 19:00–21:00 Mar 20 20:00–21:00 Mar 24 02:00–04:00 Mar 25 06:00–07:00 Mar 31 07:00–08:00
April
Apr 1 04:00–06:00 Apr 2 05:00–06:00 Apr 4 19:00–20:00 Apr 7 03:00–05:00 Apr 8 04:00–05:00 Apr 10 19:00–20:00 Apr 14 04:00–06:00 Apr 15 04:00–07:00, 18:00–20:00 Apr 16 19:00–20:00 Apr 18 22:00–23:00 Apr 22 04:00–06:00, 17:00–18:00, 23:00–24:00 Apr 23 05:00–07:00, 20:00–21:00 Apr 24 19:00–20:00 Apr 29 01:00–02:00 Apr 30 05:00–06:00, 19:00–21:00
May
May 2 19:00–21:00 May 5 04:00–07:00 May 6 04:00–06:00 May 7 02:00–03:00, 18:00–20:00 May 8 16:00–17:00 May 9 19:00–21:00 May 12 07:00–08:00 May 19 20:00–21:00 May 20 23:00–24:00 May 21 00:00–01:00, 19:00–21:00 May 22 08:00–09:00, 20:00–21:00 May 24 20:00–21:00 May 26 08:00–09:00, 19:00–20:00 May 27 03:00–04:00 May 28 02:00–06:00, 19:00–22:00
June
Jun 1 01:00–02:00, 06:00–09:00, 23:00–24:00 Jun 2 04:00–06:00, 18:00–20:00 Jun 4 05:00–06:00 Jun 5 16:00–17:00 Jun 6 08:00–09:00, 19:00–20:00 Jun 7 21:00–22:00 Jun 8 20:00–21:00 Jun 9 04:00–06:00 Jun 10 05:00–07:00 Jun 11 02:00–03:00, 05:00–07:00 Jun 24 03:00–04:00 Jun 25 04:00–06:00, 22:00–23:00 Jun 29 09:00–12:00 Jun 30 07:00–08:00
July
Jul 1 07:00–09:00 Jul 2 00:00–01:00, 04:00–07:00 Jul 3 19:00–21:00 Jul 4 08:00–09:00, 19:00–20:00 Jul 5 22:00–23:00 Jul 8 00:00–07:00 Jul 9 01:00–06:00, 19:00–20:00 Jul 10 08:00–09:00 Jul 11 08:00–09:00, 21:00–22:00 Jul 14 05:00–06:00, 20:00–21:00 Jul 15 01:00–03:00, 05:00–08:00 Jul 16 04:00–07:00 Jul 17 19:00–20:00 Jul 19 21:00–22:00 Jul 21 06:00–07:00, 19:00–21:00, 23:00–24:00 Jul 22 00:00–01:00, 04:00–08:00, 22:00–24:00 Jul 23 00:00–09:00 Jul 25 21:00–22:00 Jul 28 05:00–08:00 Jul 29 02:00–03:00, 06:00–07:00 Jul 30 01:00–07:00 Jul 31 21:00–22:00
August
Aug 3 23:00–24:00 Aug 4 00:00–01:00 Aug 10 22:00–23:00 Aug 11 05:00–07:00 Aug 12 01:00–07:00, 20:00–22:00 Aug 13 00:00–06:00, 20:00–21:00 Aug 14 22:00–23:00 Aug 15 22:00–23:00 Aug 16 19:00–20:00 Aug 18 19:00–21:00 Aug 19 03:00–04:00, 20:00–21:00 Aug 20 00:00–03:00, 20:00–21:00 Aug 22 21:00–22:00 Aug 24 23:00–24:00 Aug 25 19:00–21:00 Aug 26 07:00–09:00 Aug 27 02:00–03:00, 20:00–21:00 Aug 29 22:00–23:00 Aug 30 21:00–23:00 Aug 31 21:00–24:00
September
Sep 1 00:00–01:00, 07:00–08:00, 18:00–19:00, 23:00–24:00 Sep 2 06:00–07:00 Sep 3 05:00–06:00 Sep 4 08:00–09:00 Sep 5 20:00–22:00 Sep 7 21:00–22:00 Sep 8 06:00–07:00, 20:00–21:00, 23:00–24:00 Sep 9 02:00–05:00, 20:00–22:00 Sep 10 02:00–04:00, 07:00–08:00, 22:00–23:00 Sep 11 20:00–23:00 Sep 12 21:00–22:00 Sep 13 20:00–21:00 Sep 15 22:00–23:00 Sep 17 02:00–04:00, 07:00–08:00 Sep 19 20:00–22:00 Sep 23 01:00–02:00, 23:00–24:00 Sep 24 01:00–02:00, 19:00–20:00 Sep 25 21:00–22:00 Sep 27 21:00–22:00 Sep 28 09:00–10:00, 20:00–21:00 Sep 29 07:00–09:00 Sep 30 21:00–22:00
October
Oct 1 02:00–04:00, 07:00–09:00, 19:00–20:00 Oct 2 19:00–20:00 Oct 3 09:00–10:00 Oct 4 19:00–21:00 Oct 8 01:00–02:00, 06:00–07:00, 19:00–20:00 Oct 10 22:00–23:00 Oct 13 04:00–07:00, 18:00–20:00 Oct 14 05:00–07:00, 21:00–22:00 Oct 15 01:00–06:00, 08:00–09:00, 19:00–20:00 Oct 18 18:00–19:00 Oct 19 22:00–24:00 Oct 21 19:00–21:00 Oct 22 19:00–21:00 Oct 27 07:00–09:00, 23:00–24:00 Oct 28 01:00–02:00, 05:00–08:00 Oct 29 06:00–08:00
November
Nov 3 02:00–06:00, 20:00–21:00 Nov 4 06:00–07:00 Nov 10 07:00–08:00, 21:00–22:00 Nov 14 09:00–10:00 Nov 17 01:00–08:00, 22:00–23:00 Nov 18 00:00–01:00, 05:00–07:00 Nov 21 19:00–20:00 Nov 23 20:00–21:00 Nov 24 01:00–03:00, 05:00–08:00 Nov 25 06:00–07:00 Nov 26 00:00–02:00, 05:00–08:00, 19:00–20:00
December
Dec 1 06:00–09:00 Dec 3 06:00–07:00 Dec 9 00:00–02:00 Dec 10 08:00–09:00 Dec 15 06:00–08:00 Dec 16 23:00–24:00 Dec 17 00:00–01:00, 05:00–07:00 Dec 18 21:00–22:00 Dec 21 09:00–10:00 Dec 22 07:00–08:00 Dec 23 06:00–08:00 Dec 24 01:00–07:00 Dec 26 07:00–10:00 Dec 29 07:00–08:00 Dec 30 05:00–09:00 Dec 31 00:00–02:00