Most often in June, 30 days.
Highest follower count seen that year: 151,570.
January
Jan 8 06:00–15:00, 19:00–23:00 Jan 9 00:00–05:00, 19:00–24:00 Jan 10 01:00–15:00, 19:00–24:00 Jan 11 00:00–14:00 Jan 12 05:00–14:00 Jan 13 19:00–24:00 Jan 14 00:00–06:00, 19:00–24:00 Jan 15 00:00–15:00, 19:00–22:00 Jan 17 05:00–14:00, 21:00–24:00 Jan 18 00:00–05:00, 19:00–24:00 Jan 19 00:00–05:00 Jan 20 06:00–15:00, 19:00–24:00 Jan 21 00:00–03:00, 19:00–24:00 Jan 22 00:00–04:00, 06:00–15:00 Jan 23 20:00–22:00 Jan 24 02:00–10:00, 19:00–24:00 Jan 25 00:00–04:00, 06:00–15:00 Jan 27 05:00–15:00 Jan 28 06:00–15:00, 19:00–23:00 Jan 29 00:00–04:00, 19:00–24:00 Jan 30 01:00–14:00, 20:00–24:00 Jan 31 00:00–14:00, 16:00–24:00
February
Feb 1 00:00–01:00, 05:00–15:00 Feb 3 19:00–24:00 Feb 4 02:00–05:00, 19:00–24:00 Feb 5 00:00–05:00 Feb 6 07:00–14:00, 19:00–24:00 Feb 7 01:00–15:00 Feb 8 06:00–15:00, 19:00–23:00 Feb 9 00:00–04:00 Feb 10 06:00–15:00 Feb 12 06:00–15:00, 18:00–24:00 Feb 13 00:00–04:00, 19:00–23:00 Feb 14 00:00–04:00, 06:00–15:00, 19:00–24:00 Feb 15 00:00–04:00, 06:00–15:00, 19:00–24:00 Feb 16 01:00–04:00 Feb 17 06:00–15:00 Feb 18 06:00–15:00 Feb 19 20:00–24:00 Feb 20 01:00–04:00, 20:00–24:00 Feb 21 00:00–01:00, 06:00–15:00, 18:00–24:00 Feb 22 00:00–15:00, 17:00–24:00 Feb 23 00:00–02:00 Feb 24 07:00–15:00, 19:00–24:00 Feb 25 00:00–04:00 Feb 26 07:00–15:00 Feb 28 17:00–24:00
March
Mar 1 00:00–01:00 Mar 2 06:00–15:00 Mar 3 05:00–15:00, 19:00–24:00 Mar 4 00:00–04:00, 20:00–24:00 Mar 5 01:00–04:00 Mar 6 06:00–15:00, 20:00–24:00 Mar 7 00:00–05:00, 07:00–15:00, 20:00–24:00 Mar 8 00:00–05:00 Mar 11 19:00–24:00 Mar 12 01:00–04:00, 19:00–23:00 Mar 13 02:00–05:00 Mar 14 20:00–24:00 Mar 15 00:00–01:00, 19:00–24:00 Mar 16 00:00–05:00, 19:00–24:00 Mar 17 00:00–15:00 Mar 18 06:00–15:00, 20:00–24:00 Mar 19 00:00–05:00, 19:00–24:00 Mar 20 00:00–04:00, 06:00–15:00, 20:00–24:00 Mar 21 00:00–15:00, 19:00–23:00 Mar 22 00:00–15:00, 19:00–24:00 Mar 23 01:00–04:00 Mar 24 06:00–15:00 Mar 25 06:00–15:00, 20:00–24:00 Mar 26 00:00–06:00, 19:00–23:00 Mar 27 00:00–04:00 Mar 28 06:00–24:00 Mar 29 00:00–01:00, 06:00–14:00 Mar 30 06:00–15:00, 20:00–24:00 Mar 31 00:00–04:00, 07:00–16:00
April
Apr 1 07:00–16:00 Apr 3 20:00–24:00 Apr 4 01:00–15:00, 20:00–24:00 Apr 5 00:00–05:00, 19:00–24:00 Apr 6 00:00–04:00, 19:00–24:00 Apr 7 01:00–04:00, 06:00–15:00 Apr 8 06:00–15:00, 20:00–24:00 Apr 9 00:00–04:00 Apr 10 06:00–15:00, 20:00–24:00 Apr 11 00:00–04:00, 06:00–15:00, 20:00–24:00 Apr 12 00:00–15:00 Apr 13 20:00–24:00 Apr 14 00:00–04:00, 06:00–15:00 Apr 15 07:00–16:00, 21:00–24:00 Apr 16 01:00–04:00 Apr 17 06:00–15:00, 20:00–24:00 Apr 18 02:00–04:00, 07:00–16:00, 18:00–24:00 Apr 19 00:00–01:00, 06:00–14:00 Apr 21 06:00–15:00, 20:00–23:00 Apr 22 01:00–04:00 Apr 23 06:00–15:00 Apr 24 19:00–23:00 Apr 25 00:00–14:00, 19:00–24:00 Apr 26 00:00–04:00, 06:00–16:00, 20:00–23:00 Apr 27 00:00–04:00, 06:00–15:00, 19:00–23:00 Apr 28 01:00–04:00, 07:00–14:00, 19:00–23:00 Apr 29 00:00–04:00, 07:00–16:00, 19:00–24:00 Apr 30 00:00–15:00, 17:00–24:00
May
May 1 00:00–01:00 May 4 06:00–15:00, 19:00–22:00 May 5 00:00–04:00, 06:00–16:00 May 6 19:00–24:00 May 7 00:00–04:00, 06:00–15:00, 20:00–24:00 May 8 00:00–14:00, 19:00–24:00 May 9 00:00–05:00 May 10 06:00–15:00, 20:00–24:00 May 11 01:00–16:00, 20:00–24:00 May 12 01:00–05:00, 19:00–24:00 May 13 00:00–04:00, 08:00–15:00 May 14 06:00–16:00 May 15 06:00–15:00, 19:00–24:00 May 16 00:00–05:00, 17:00–24:00 May 17 00:00–01:00, 06:00–15:00 May 18 06:00–16:00, 21:00–24:00 May 19 00:00–05:00, 18:00–24:00 May 20 00:00–03:00, 05:00–14:00 May 21 06:00–16:00 May 22 20:00–24:00 May 23 00:00–04:00, 06:00–16:00, 19:00–24:00 May 24 00:00–04:00, 06:00–16:00, 19:00–24:00 May 25 01:00–04:00, 07:00–16:00, 19:00–24:00 May 26 00:00–04:00, 06:00–16:00 May 27 19:00–23:00 May 28 00:00–05:00, 07:00–16:00, 19:00–24:00 May 29 00:00–04:00, 19:00–24:00 May 30 00:00–04:00, 07:00–16:00, 20:00–24:00 May 31 00:00–04:00, 07:00–16:00
June
Jun 1 07:00–17:00, 19:00–24:00 Jun 2 00:00–04:00, 19:00–24:00 Jun 3 00:00–04:00, 06:00–16:00, 19:00–24:00 Jun 4 00:00–04:00, 06:00–15:00, 19:00–24:00 Jun 5 00:00–04:00, 17:00–24:00 Jun 6 00:00–01:00 Jun 7 07:00–17:00 Jun 8 06:00–16:00, 20:00–24:00 Jun 9 00:00–04:00, 07:00–16:00, 19:00–24:00 Jun 10 00:00–04:00, 08:00–17:00 Jun 11 07:00–17:00, 19:00–24:00 Jun 12 00:00–04:00, 07:00–17:00, 23:00–24:00 Jun 13 00:00–04:00, 19:00–24:00 Jun 14 00:00–04:00, 07:00–17:00 Jun 15 07:00–10:00, 12:00–18:00, 20:00–24:00 Jun 16 00:00–05:00, 19:00–24:00 Jun 17 00:00–04:00, 06:00–15:00, 20:00–23:00 Jun 18 00:00–15:00 Jun 19 10:00–24:00 Jun 20 00:00–04:00, 20:00–24:00 Jun 21 00:00–04:00 Jun 22 19:00–24:00 Jun 23 00:00–04:00, 07:00–17:00, 20:00–24:00 Jun 24 00:00–04:00, 20:00–24:00 Jun 25 00:00–04:00, 08:00–24:00 Jun 26 00:00–01:00 Jun 27 07:00–18:00 Jun 28 08:00–18:00 Jun 29 07:00–16:00 Jun 30 08:00–18:00
July
Jul 1 07:00–16:00 Jul 3 08:00–17:00 Jul 5 07:00–18:00 Jul 6 08:00–17:00 Jul 7 07:00–17:00 Jul 9 08:00–18:00 Jul 11 08:00–17:00 Jul 12 07:00–16:00 Jul 13 08:00–18:00 Jul 14 08:00–18:00 Jul 16 08:00–18:00 Jul 18 06:00–15:00, 18:00–24:00 Jul 19 00:00–04:00, 08:00–17:00 Jul 20 08:00–17:00 Jul 21 07:00–24:00 Jul 22 00:00–04:00, 18:00–24:00 Jul 23 00:00–04:00, 07:00–16:00 Jul 24 18:00–24:00 Jul 25 00:00–04:00, 18:00–24:00 Jul 26 00:00–04:00, 10:00–24:00 Jul 27 00:00–04:00, 07:00–24:00 Jul 28 00:00–04:00, 06:00–14:00 Jul 29 07:00–24:00 Jul 30 01:00–04:00, 06:00–22:00
August
Aug 1 07:00–18:00 Aug 2 07:00–15:00 Aug 3 07:00–17:00 Aug 4 07:00–17:00 Aug 6 07:00–17:00 Aug 8 08:00–18:00 Aug 9 10:00–17:00 Aug 10 08:00–18:00 Aug 11 08:00–18:00 Aug 13 08:00–16:00