Most often in July, 30 days.
Highest follower count seen that year: 21,363.
January
Jan 1 20:00–24:00 Jan 2 00:00–02:00 Jan 4 20:00–24:00 Jan 5 00:00–03:00, 20:00–23:00 Jan 6 03:00–09:00 Jan 7 20:00–24:00 Jan 8 00:00–02:00, 21:00–24:00 Jan 9 00:00–02:00 Jan 10 20:00–24:00 Jan 11 00:00–01:00, 20:00–24:00 Jan 12 00:00–03:00, 19:00–24:00 Jan 13 00:00–06:00, 20:00–24:00 Jan 14 00:00–02:00, 20:00–24:00 Jan 15 00:00–01:00, 21:00–24:00 Jan 16 00:00–02:00 Jan 17 19:00–24:00 Jan 18 18:00–24:00 Jan 19 00:00–02:00 Jan 20 01:00–11:00, 20:00–24:00 Jan 21 00:00–02:00 Jan 22 03:00–11:00 Jan 23 20:00–22:00 Jan 24 20:00–24:00 Jan 25 00:00–02:00 Jan 26 19:00–24:00 Jan 27 00:00–02:00, 04:00–08:00
February
Feb 1 20:00–23:00 Feb 2 00:00–02:00, 19:00–24:00 Feb 3 00:00–04:00 Feb 4 19:00–24:00 Feb 5 00:00–02:00, 21:00–24:00 Feb 6 00:00–02:00, 20:00–24:00 Feb 7 00:00–02:00, 20:00–24:00 Feb 8 00:00–02:00, 20:00–24:00 Feb 9 00:00–02:00 Feb 10 05:00–10:00, 20:00–24:00 Feb 11 00:00–02:00 Feb 12 20:00–24:00 Feb 13 00:00–02:00, 20:00–24:00 Feb 14 00:00–02:00, 20:00–24:00 Feb 15 00:00–02:00, 20:00–24:00 Feb 16 00:00–02:00 Feb 18 20:00–24:00 Feb 19 00:00–02:00, 20:00–24:00 Feb 20 00:00–02:00, 20:00–24:00 Feb 21 00:00–03:00, 20:00–24:00 Feb 22 00:00–01:00, 20:00–24:00 Feb 23 00:00–02:00 Feb 24 02:00–07:00, 20:00–24:00 Feb 25 00:00–02:00, 20:00–24:00 Feb 26 00:00–02:00 Feb 27 20:00–24:00 Feb 28 00:00–02:00, 20:00–24:00
March
Mar 1 00:00–02:00 Mar 3 05:00–11:00, 20:00–24:00 Mar 4 00:00–02:00, 20:00–24:00 Mar 5 00:00–02:00, 20:00–24:00 Mar 6 00:00–02:00 Mar 8 19:00–24:00 Mar 9 00:00–02:00, 19:00–24:00 Mar 10 00:00–02:00, 20:00–24:00 Mar 11 00:00–02:00 Mar 12 04:00–11:00 Mar 13 01:00–04:00, 21:00–24:00 Mar 14 00:00–02:00, 19:00–24:00 Mar 15 00:00–02:00, 13:00–18:00 Mar 17 20:00–24:00 Mar 18 00:00–02:00 Mar 19 19:00–24:00 Mar 20 00:00–02:00, 19:00–24:00 Mar 21 00:00–02:00, 20:00–24:00 Mar 22 00:00–02:00, 20:00–24:00 Mar 23 00:00–02:00, 19:00–24:00 Mar 24 00:00–02:00, 20:00–24:00 Mar 25 00:00–01:00 Mar 26 03:00–11:00, 20:00–24:00 Mar 27 00:00–02:00, 19:00–24:00 Mar 28 00:00–02:00 Mar 29 18:00–23:00 Mar 31 19:00–24:00
April
Apr 1 00:00–02:00 Apr 3 19:00–24:00 Apr 4 00:00–03:00 Apr 5 03:00–10:00, 20:00–24:00 Apr 6 01:00–02:00 Apr 7 04:00–09:00, 20:00–24:00 Apr 8 00:00–02:00, 20:00–24:00 Apr 9 00:00–02:00, 21:00–24:00 Apr 10 00:00–02:00 Apr 12 20:00–24:00 Apr 13 00:00–02:00, 21:00–24:00 Apr 14 00:00–02:00, 19:00–24:00 Apr 15 00:00–01:00, 04:00–10:00, 20:00–24:00 Apr 16 00:00–02:00 Apr 18 04:00–11:00, 20:00–24:00 Apr 19 00:00–01:00 Apr 20 20:00–24:00 Apr 21 00:00–01:00, 04:00–08:00 Apr 22 20:00–24:00 Apr 23 00:00–02:00, 21:00–24:00 Apr 24 00:00–02:00, 20:00–24:00 Apr 25 00:00–01:00 Apr 27 04:00–08:00, 10:00–11:00, 21:00–24:00 Apr 28 00:00–02:00 Apr 30 04:00–11:00, 20:00–24:00
May
May 1 00:00–02:00 May 2 20:00–24:00 May 3 00:00–02:00, 20:00–24:00 May 4 01:00–02:00, 20:00–23:00 May 5 00:00–02:00 May 6 21:00–24:00 May 7 00:00–03:00, 22:00–23:00 May 8 03:00–10:00, 20:00–24:00 May 9 00:00–02:00, 20:00–24:00 May 10 00:00–02:00 May 12 03:00–11:00, 21:00–24:00 May 13 00:00–02:00, 20:00–24:00 May 14 00:00–03:00, 20:00–24:00 May 15 00:00–02:00, 21:00–24:00 May 16 00:00–02:00 May 18 19:00–24:00 May 19 00:00–10:00 May 20 20:00–24:00 May 21 00:00–02:00, 16:00–23:00 May 22 23:00–24:00 May 23 00:00–10:00 May 26 20:00–24:00 May 27 00:00–02:00, 20:00–24:00 May 28 00:00–02:00, 20:00–24:00 May 29 00:00–02:00, 20:00–24:00 May 30 00:00–02:00, 21:00–24:00 May 31 00:00–03:00, 13:00–19:00
June
Jun 1 20:00–24:00 Jun 2 00:00–03:00, 06:00–11:00, 20:00–24:00 Jun 3 02:00–06:00, 20:00–24:00 Jun 4 00:00–02:00 Jun 5 20:00–24:00 Jun 6 00:00–03:00, 20:00–24:00 Jun 7 00:00–02:00, 20:00–24:00 Jun 8 01:00–02:00 Jun 9 03:00–10:00 Jun 10 20:00–24:00 Jun 11 00:00–03:00, 22:00–24:00 Jun 12 00:00–02:00, 20:00–24:00 Jun 13 00:00–02:00 Jun 14 20:00–24:00 Jun 15 00:00–02:00, 20:00–24:00 Jun 16 00:00–02:00 Jun 17 20:00–24:00 Jun 18 00:00–03:00, 20:00–24:00 Jun 19 00:00–02:00, 20:00–24:00 Jun 20 00:00–02:00 Jun 23 04:00–11:00, 20:00–24:00 Jun 24 00:00–02:00, 20:00–24:00 Jun 25 00:00–02:00, 20:00–24:00 Jun 26 00:00–02:00, 20:00–24:00 Jun 27 00:00–02:00, 20:00–24:00 Jun 28 00:00–02:00, 20:00–24:00 Jun 29 00:00–02:00
July
Jul 1 20:00–24:00 Jul 2 00:00–02:00, 20:00–24:00 Jul 3 00:00–02:00 Jul 4 20:00–24:00 Jul 5 00:00–03:00, 20:00–24:00 Jul 6 00:00–02:00, 20:00–24:00 Jul 7 00:00–01:00, 20:00–24:00 Jul 8 00:00–02:00, 20:00–23:00 Jul 9 21:00–24:00 Jul 10 00:00–02:00, 20:00–24:00 Jul 11 00:00–02:00 Jul 12 21:00–24:00 Jul 13 00:00–02:00, 20:00–24:00 Jul 14 00:00–02:00 Jul 15 20:00–24:00 Jul 16 00:00–01:00 Jul 18 20:00–24:00 Jul 19 00:00–02:00, 12:00–19:00 Jul 20 21:00–24:00 Jul 21 00:00–02:00, 20:00–24:00 Jul 22 00:00–02:00, 20:00–24:00 Jul 23 00:00–02:00 Jul 24 20:00–24:00 Jul 25 00:00–02:00, 20:00–24:00 Jul 26 00:00–02:00, 21:00–24:00 Jul 27 00:00–02:00 Jul 28 20:00–24:00 Jul 29 00:00–02:00, 20:00–24:00 Jul 30 01:00–02:00, 20:00–24:00 Jul 31 00:00–02:00, 20:00–24:00
August
Aug 1 00:00–02:00 Aug 2 04:00–12:00 Aug 4 20:00–24:00 Aug 5 00:00–01:00, 20:00–24:00 Aug 6 00:00–02:00, 20:00–24:00 Aug 7 00:00–02:00, 20:00–24:00 Aug 8 00:00–02:00 Aug 10 04:00–09:00, 20:00–24:00 Aug 11 00:00–03:00, 20:00–24:00 Aug 12 00:00–02:00 Aug 13 20:00–24:00 Aug 14 00:00–02:00, 21:00–24:00 Aug 15 00:00–02:00, 22:00–24:00 Aug 16 00:00–02:00 Aug 18 20:00–24:00 Aug 19 00:00–02:00, 21:00–24:00 Aug 20 20:00–24:00 Aug 21 00:00–02:00, 20:00–24:00 Aug 22 00:00–03:00, 20:00–23:00 Aug 23 00:00–03:00, 21:00–24:00 Aug 24 00:00–02:00 Aug 25 20:00–24:00 Aug 26 00:00–02:00, 20:00–23:00 Aug 27 00:00–03:00, 21:00–24:00 Aug 28 00:00–02:00, 20:00–24:00 Aug 29 00:00–02:00 Aug 30 20:00–24:00 Aug 31 00:00–01:00, 07:00–10:00
September
Sep 2 20:00–24:00 Sep 3 00:00–02:00, 20:00–24:00 Sep 4 00:00–02:00, 20:00–24:00 Sep 5 00:00–02:00, 16:00–20:00 Sep 6 04:00–07:00, 20:00–24:00 Sep 7 00:00–03:00, 19:00–24:00 Sep 8 05:00–08:00, 19:00–24:00 Sep 9 00:00–02:00 Sep 11 19:00–24:00 Sep 12 00:00–02:00, 20:00–24:00 Sep 13 00:00–02:00 Sep 14 04:00–11:00 Sep 15 20:00–24:00 Sep 16 00:00–02:00 Sep 17 20:00–24:00 Sep 18 00:00–02:00, 19:00–24:00 Sep 19 00:00–02:00, 20:00–24:00 Sep 20 00:00–02:00, 20:00–24:00 Sep 21 00:00–02:00, 20:00–24:00 Sep 22 00:00–02:00, 20:00–24:00 Sep 23 00:00–02:00, 19:00–21:00 Sep 25 21:00–24:00 Sep 26 00:00–02:00, 20:00–24:00 Sep 27 00:00–02:00 Sep 28 04:00–08:00, 10:00–11:00 Sep 29 04:00–11:00, 20:00–24:00 Sep 30 00:00–02:00, 21:00–24:00
October
Oct 1 00:00–02:00 Oct 2 20:00–24:00 Oct 3 01:00–02:00, 20:00–24:00 Oct 4 01:00–02:00 Oct 5 08:00–11:00, 20:00–24:00 Oct 6 01:00–02:00, 20:00–24:00 Oct 7 00:00–02:00, 20:00–24:00 Oct 8 00:00–02:00, 20:00–24:00 Oct 9 01:00–02:00 Oct 10 20:00–24:00 Oct 11 00:00–02:00 Oct 12 20:00–23:00 Oct 13 00:00–02:00, 22:00–24:00 Oct 14 00:00–02:00 Oct 15 03:00–10:00 Oct 16 04:00–10:00, 20:00–23:00 Oct 17 00:00–02:00, 21:00–24:00 Oct 18 00:00–03:00 Oct 20 20:00–24:00 Oct 21 00:00–02:00, 20:00–24:00 Oct 22 00:00–03:00, 20:00–23:00 Oct 24 20:00–24:00 Oct 25 00:00–02:00, 20:00–24:00 Oct 26 00:00–02:00, 20:00–24:00 Oct 27 00:00–02:00, 21:00–24:00 Oct 28 00:00–02:00, 20:00–24:00 Oct 29 00:00–02:00, 19:00–24:00 Oct 30 00:00–02:00, 21:00–23:00 Oct 31 00:00–01:00, 20:00–24:00
November
Nov 1 00:00–01:00 Nov 4 02:00–09:00, 20:00–24:00 Nov 5 00:00–02:00, 20:00–24:00 Nov 6 01:00–02:00, 22:00–24:00 Nov 7 00:00–02:00, 20:00–24:00 Nov 8 00:00–02:00, 20:00–24:00 Nov 9 00:00–02:00, 18:00–24:00 Nov 10 20:00–24:00 Nov 11 00:00–02:00 Nov 12 21:00–24:00 Nov 13 00:00–02:00, 20:00–24:00 Nov 14 00:00–02:00, 20:00–24:00 Nov 15 01:00–04:00 Nov 17 20:00–24:00 Nov 18 00:00–02:00, 20:00–24:00 Nov 19 01:00–02:00, 20:00–24:00 Nov 20 00:00–02:00 Nov 21 21:00–24:00 Nov 22 00:00–02:00, 20:00–24:00 Nov 23 00:00–02:00, 20:00–24:00 Nov 24 00:00–02:00 Nov 25 04:00–11:00, 19:00–24:00 Nov 26 00:00–02:00, 18:00–24:00 Nov 27 00:00–02:00 Nov 30 06:00–10:00, 20:00–24:00
December
Dec 1 00:00–02:00, 20:00–24:00 Dec 2 01:00–02:00 Dec 3 20:00–24:00 Dec 4 00:00–03:00, 20:00–24:00 Dec 5 00:00–02:00, 20:00–24:00 Dec 6 00:00–02:00 Dec 7 18:00–24:00 Dec 8 00:00–01:00, 21:00–24:00 Dec 9 00:00–02:00, 20:00–24:00 Dec 10 00:00–02:00 Dec 11 04:00–11:00, 20:00–23:00 Dec 12 00:00–02:00, 21:00–24:00 Dec 13 01:00–03:00, 21:00–24:00 Dec 14 00:00–02:00, 20:00–24:00 Dec 15 00:00–02:00, 20:00–24:00 Dec 16 01:00–02:00 Dec 18 22:00–24:00 Dec 19 21:00–24:00 Dec 20 00:00–02:00, 19:00–24:00 Dec 21 00:00–02:00 Dec 23 05:00–10:00, 20:00–24:00 Dec 24 00:00–02:00, 22:00–24:00 Dec 25 00:00–01:00 Dec 26 20:00–24:00 Dec 27 00:00–02:00, 21:00–24:00 Dec 28 00:00–02:00, 20:00–24:00 Dec 29 00:00–03:00, 20:00–24:00 Dec 30 00:00–02:00 Dec 31 06:00–11:00