Most often in August, 30 days.
Highest follower count seen that year: 30,061.
January
Jan 8 17:00–20:00 Jan 9 03:00–05:00 Jan 13 03:00–05:00, 17:00–18:00 Jan 18 03:00–05:00 Jan 19 07:00–09:00 Jan 20 03:00–09:00, 17:00–20:00 Jan 21 20:00–23:00 Jan 23 15:00–17:00 Jan 24 17:00–19:00 Jan 27 18:00–21:00 Jan 28 15:00–23:00 Jan 29 06:00–07:00, 13:00–16:00, 19:00–20:00 Jan 30 00:00–01:00, 18:00–20:00 Jan 31 00:00–02:00, 16:00–17:00
February
Feb 1 16:00–17:00, 23:00–24:00 Feb 2 00:00–01:00 Feb 3 17:00–21:00 Feb 4 00:00–02:00, 06:00–07:00, 16:00–19:00 Feb 5 14:00–17:00 Feb 7 16:00–19:00 Feb 11 01:00–02:00, 16:00–21:00, 23:00–24:00 Feb 12 00:00–08:00, 14:00–18:00 Feb 13 06:00–08:00, 15:00–23:00 Feb 14 01:00–08:00 Feb 16 03:00–08:00, 16:00–19:00 Feb 17 08:00–10:00 Feb 18 01:00–02:00 Feb 19 16:00–19:00 Feb 20 01:00–06:00, 15:00–18:00 Feb 22 03:00–05:00 Feb 24 17:00–22:00 Feb 25 19:00–22:00 Feb 26 06:00–08:00
March
Mar 1 19:00–22:00 Mar 2 15:00–19:00 Mar 3 04:00–05:00, 21:00–22:00 Mar 4 18:00–20:00 Mar 5 16:00–18:00 Mar 6 01:00–05:00, 15:00–19:00 Mar 7 13:00–17:00 Mar 9 15:00–21:00 Mar 10 16:00–18:00 Mar 11 13:00–15:00 Mar 12 07:00–08:00, 17:00–18:00 Mar 13 03:00–05:00, 15:00–19:00, 23:00–24:00 Mar 14 17:00–22:00 Mar 15 01:00–02:00, 05:00–06:00, 14:00–16:00, 19:00–24:00 Mar 16 16:00–18:00, 23:00–24:00 Mar 17 02:00–07:00, 14:00–20:00 Mar 18 01:00–05:00, 11:00–17:00, 20:00–21:00 Mar 19 04:00–05:00, 12:00–14:00, 20:00–24:00 Mar 20 04:00–05:00, 12:00–18:00, 21:00–24:00 Mar 21 16:00–17:00 Mar 22 15:00–19:00 Mar 24 05:00–07:00, 15:00–17:00 Mar 25 14:00–15:00, 19:00–20:00 Mar 26 02:00–04:00, 14:00–18:00 Mar 27 02:00–04:00, 15:00–17:00 Mar 28 17:00–18:00, 22:00–24:00 Mar 30 14:00–20:00 Mar 31 12:00–15:00, 23:00–24:00
April
Apr 1 16:00–18:00, 20:00–22:00 Apr 2 16:00–20:00 Apr 3 16:00–18:00 Apr 5 00:00–03:00, 17:00–18:00 Apr 6 17:00–21:00 Apr 7 13:00–20:00 Apr 8 00:00–03:00, 18:00–21:00 Apr 9 07:00–08:00, 15:00–16:00 Apr 10 16:00–18:00, 20:00–22:00 Apr 11 19:00–20:00 Apr 12 09:00–10:00, 16:00–18:00 Apr 13 08:00–09:00, 16:00–21:00 Apr 14 00:00–02:00 Apr 15 16:00–18:00 Apr 16 15:00–20:00 Apr 17 02:00–06:00, 13:00–15:00 Apr 18 16:00–17:00 Apr 19 02:00–03:00, 17:00–18:00 Apr 20 09:00–11:00, 16:00–18:00, 20:00–21:00 Apr 21 01:00–04:00 Apr 22 01:00–04:00, 18:00–20:00 Apr 25 13:00–17:00 Apr 26 02:00–04:00, 14:00–17:00 Apr 27 02:00–03:00, 08:00–09:00, 15:00–19:00 Apr 29 16:00–20:00 Apr 30 02:00–04:00, 09:00–10:00, 15:00–17:00, 22:00–23:00
May
May 3 02:00–03:00 May 4 12:00–13:00 May 6 09:00–10:00 May 8 22:00–24:00 May 9 14:00–16:00, 18:00–19:00 May 10 03:00–04:00, 17:00–18:00 May 11 08:00–10:00, 15:00–17:00 May 12 16:00–18:00 May 13 02:00–03:00, 09:00–10:00, 18:00–21:00 May 14 08:00–10:00, 18:00–19:00 May 15 06:00–07:00 May 16 02:00–05:00, 12:00–16:00, 23:00–24:00 May 17 20:00–24:00 May 19 01:00–03:00, 17:00–19:00 May 20 08:00–10:00 May 21 01:00–04:00, 08:00–10:00 May 22 04:00–06:00 May 23 06:00–07:00, 20:00–21:00 May 24 01:00–04:00, 08:00–10:00, 15:00–19:00 May 25 03:00–04:00, 16:00–17:00 May 26 09:00–10:00, 16:00–17:00 May 27 00:00–04:00, 08:00–10:00, 17:00–19:00, 23:00–24:00 May 28 00:00–04:00, 08:00–09:00, 16:00–18:00 May 29 02:00–05:00, 17:00–19:00 May 30 03:00–07:00, 15:00–16:00 May 31 01:00–03:00, 19:00–20:00, 23:00–24:00
June
Jun 1 00:00–04:00, 10:00–11:00, 16:00–20:00 Jun 2 00:00–01:00, 03:00–04:00, 09:00–10:00, 17:00–20:00 Jun 3 01:00–04:00, 16:00–22:00 Jun 4 03:00–04:00, 08:00–10:00, 17:00–20:00 Jun 5 01:00–07:00, 16:00–17:00, 22:00–24:00 Jun 6 00:00–07:00, 16:00–17:00 Jun 7 02:00–04:00, 09:00–10:00, 17:00–18:00 Jun 8 01:00–04:00 Jun 9 09:00–10:00, 20:00–23:00 Jun 10 09:00–10:00, 16:00–17:00, 21:00–24:00 Jun 11 01:00–04:00, 08:00–09:00, 17:00–18:00, 23:00–24:00 Jun 12 00:00–01:00, 14:00–16:00 Jun 13 03:00–06:00, 15:00–18:00 Jun 14 04:00–05:00, 09:00–10:00, 17:00–18:00 Jun 15 01:00–06:00, 16:00–18:00 Jun 16 02:00–08:00, 17:00–19:00 Jun 17 04:00–07:00, 17:00–18:00 Jun 18 05:00–07:00, 17:00–19:00 Jun 19 02:00–08:00, 17:00–20:00 Jun 20 05:00–08:00, 15:00–20:00 Jun 21 00:00–07:00, 19:00–20:00 Jun 22 06:00–07:00, 16:00–19:00 Jun 23 01:00–08:00, 16:00–18:00 Jun 24 03:00–07:00, 14:00–16:00 Jun 25 00:00–08:00, 16:00–19:00 Jun 26 02:00–06:00 Jun 27 15:00–18:00 Jun 28 06:00–07:00, 17:00–19:00 Jun 30 06:00–08:00, 17:00–21:00
July
Jul 1 01:00–07:00, 18:00–20:00 Jul 2 05:00–08:00, 23:00–24:00 Jul 3 00:00–07:00, 16:00–18:00 Jul 4 06:00–07:00, 16:00–17:00, 23:00–24:00 Jul 5 06:00–07:00, 17:00–18:00, 23:00–24:00 Jul 6 03:00–04:00, 06:00–07:00, 16:00–18:00 Jul 8 18:00–23:00 Jul 9 18:00–21:00 Jul 10 00:00–01:00, 04:00–08:00, 16:00–17:00 Jul 11 04:00–06:00, 15:00–18:00 Jul 12 16:00–18:00, 20:00–24:00 Jul 13 14:00–17:00, 21:00–24:00 Jul 14 00:00–05:00, 19:00–22:00 Jul 15 11:00–17:00 Jul 16 02:00–07:00, 22:00–23:00 Jul 17 06:00–07:00 Jul 18 22:00–23:00 Jul 19 22:00–24:00 Jul 20 18:00–20:00 Jul 21 16:00–18:00, 22:00–24:00 Jul 22 00:00–01:00, 15:00–22:00 Jul 23 20:00–22:00 Jul 24 03:00–09:00 Jul 25 04:00–08:00, 16:00–17:00, 23:00–24:00 Jul 26 00:00–02:00, 17:00–18:00, 23:00–24:00 Jul 27 12:00–17:00 Jul 28 05:00–09:00, 18:00–19:00, 21:00–24:00 Jul 29 15:00–17:00 Jul 30 12:00–14:00, 19:00–23:00 Jul 31 05:00–08:00
August
Aug 1 01:00–08:00, 20:00–23:00 Aug 3 00:00–01:00, 20:00–22:00 Aug 4 19:00–24:00 Aug 5 11:00–16:00, 22:00–24:00 Aug 6 00:00–03:00, 06:00–07:00, 19:00–21:00 Aug 7 05:00–06:00, 14:00–18:00 Aug 8 11:00–17:00 Aug 9 12:00–21:00 Aug 10 11:00–15:00, 22:00–24:00 Aug 11 00:00–01:00, 13:00–17:00 Aug 12 11:00–16:00 Aug 13 12:00–18:00 Aug 14 11:00–12:00, 14:00–17:00, 20:00–24:00 Aug 15 12:00–17:00, 21:00–24:00 Aug 16 00:00–01:00, 12:00–16:00 Aug 17 10:00–17:00 Aug 18 00:00–03:00, 11:00–16:00 Aug 19 12:00–18:00 Aug 20 11:00–16:00, 18:00–19:00 Aug 21 10:00–15:00 Aug 22 12:00–15:00, 17:00–19:00 Aug 23 03:00–05:00, 11:00–18:00, 20:00–24:00 Aug 24 00:00–02:00, 14:00–21:00 Aug 25 23:00–24:00 Aug 26 00:00–02:00, 14:00–20:00 Aug 27 16:00–17:00, 21:00–23:00 Aug 28 03:00–05:00, 14:00–20:00, 23:00–24:00 Aug 29 00:00–01:00, 04:00–09:00, 22:00–24:00 Aug 30 00:00–03:00, 06:00–11:00, 20:00–23:00 Aug 31 06:00–09:00
September
Sep 1 03:00–07:00, 17:00–24:00 Sep 2 03:00–09:00, 18:00–20:00 Sep 3 01:00–08:00, 15:00–16:00 Sep 4 13:00–18:00 Sep 5 01:00–02:00, 07:00–09:00, 18:00–22:00 Sep 6 02:00–03:00, 07:00–08:00, 20:00–23:00 Sep 7 08:00–09:00, 16:00–19:00 Sep 8 14:00–24:00 Sep 9 00:00–02:00, 06:00–08:00, 20:00–22:00 Sep 10 04:00–08:00, 16:00–18:00, 20:00–22:00 Sep 11 11:00–13:00, 20:00–24:00 Sep 12 00:00–02:00, 16:00–21:00 Sep 13 13:00–19:00 Sep 14 01:00–08:00, 17:00–21:00 Sep 15 03:00–07:00, 20:00–24:00 Sep 16 02:00–06:00, 14:00–17:00, 21:00–23:00 Sep 17 13:00–21:00 Sep 18 05:00–07:00, 16:00–19:00 Sep 19 13:00–19:00 Sep 20 20:00–22:00 Sep 22 02:00–05:00, 14:00–23:00 Sep 23 04:00–08:00 Sep 25 02:00–07:00, 15:00–18:00 Sep 26 12:00–18:00 Sep 27 06:00–07:00, 13:00–17:00 Sep 28 07:00–09:00, 16:00–21:00
October
Oct 3 16:00–18:00 Oct 4 15:00–20:00 Oct 5 16:00–19:00 Oct 6 14:00–19:00 Oct 9 17:00–18:00 Oct 10 16:00–19:00 Oct 11 15:00–16:00, 18:00–20:00 Oct 12 18:00–20:00 Oct 13 16:00–19:00 Oct 14 16:00–18:00 Oct 15 19:00–24:00 Oct 16 01:00–02:00 Oct 24 16:00–20:00 Oct 25 13:00–18:00 Oct 28 15:00–16:00 Oct 29 05:00–08:00, 16:00–19:00 Oct 30 15:00–16:00 Oct 31 16:00–18:00
November
Nov 1 20:00–23:00 Nov 3 22:00–24:00 Nov 4 00:00–02:00, 16:00–21:00 Nov 6 21:00–23:00 Nov 10 03:00–04:00 Nov 11 20:00–24:00 Nov 12 00:00–04:00, 16:00–17:00, 23:00–24:00 Nov 13 00:00–01:00 Nov 14 02:00–04:00, 16:00–17:00, 22:00–24:00 Nov 15 00:00–06:00, 18:00–24:00 Nov 16 08:00–11:00, 14:00–16:00, 20:00–24:00 Nov 17 00:00–04:00 Nov 19 06:00–08:00 Nov 20 05:00–06:00, 16:00–21:00 Nov 23 19:00–24:00 Nov 24 00:00–03:00, 05:00–06:00, 17:00–21:00 Nov 25 06:00–09:00, 16:00–23:00 Nov 26 06:00–10:00, 17:00–20:00 Nov 27 04:00–10:00, 18:00–19:00 Nov 28 02:00–09:00, 17:00–19:00 Nov 29 05:00–08:00, 17:00–20:00 Nov 30 02:00–06:00, 15:00–20:00
December
Dec 1 04:00–07:00 Dec 2 06:00–08:00, 21:00–24:00 Dec 3 00:00–09:00, 17:00–18:00 Dec 4 03:00–09:00, 20:00–22:00 Dec 5 11:00–13:00, 20:00–24:00 Dec 6 00:00–01:00, 09:00–13:00, 20:00–22:00 Dec 7 00:00–02:00, 05:00–11:00, 18:00–19:00, 21:00–22:00 Dec 8 03:00–06:00, 16:00–18:00, 23:00–24:00 Dec 9 11:00–15:00 Dec 10 03:00–08:00, 18:00–20:00 Dec 11 05:00–09:00, 19:00–23:00 Dec 12 04:00–05:00, 10:00–11:00, 20:00–21:00 Dec 13 06:00–07:00, 20:00–22:00 Dec 14 05:00–11:00 Dec 15 07:00–11:00, 16:00–19:00 Dec 16 04:00–07:00 Dec 17 17:00–18:00, 20:00–22:00 Dec 18 04:00–05:00 Dec 20 16:00–17:00 Dec 21 17:00–18:00 Dec 22 06:00–08:00 Dec 23 13:00–14:00 Dec 24 06:00–08:00, 18:00–19:00, 21:00–22:00 Dec 25 17:00–19:00 Dec 26 19:00–20:00 Dec 27 19:00–22:00 Dec 28 13:00–16:00 Dec 29 07:00–11:00, 17:00–19:00 Dec 30 16:00–20:00