Most often in May, 28 days.
Highest follower count seen that year: 9,919.
January
Jan 1 20:00–22:00 Jan 4 21:00–23:00 Jan 5 08:00–13:00, 17:00–19:00 Jan 6 17:00–24:00 Jan 7 00:00–01:00, 07:00–12:00 Jan 8 19:00–23:00 Jan 11 21:00–23:00 Jan 12 07:00–13:00 Jan 13 20:00–23:00 Jan 14 20:00–23:00 Jan 15 09:00–10:00, 21:00–22:00 Jan 16 17:00–18:00 Jan 18 20:00–21:00 Jan 19 18:00–21:00 Jan 20 08:00–13:00, 17:00–19:00, 22:00–24:00 Jan 21 21:00–22:00 Jan 22 20:00–23:00 Jan 23 08:00–15:00 Jan 24 21:00–22:00 Jan 26 07:00–18:00, 20:00–22:00 Jan 27 21:00–22:00 Jan 28 18:00–19:00, 21:00–22:00 Jan 29 18:00–22:00 Jan 30 08:00–13:00, 17:00–18:00 Jan 31 09:00–10:00, 23:00–24:00
February
Feb 1 20:00–21:00 Feb 2 18:00–22:00 Feb 3 08:00–13:00, 18:00–21:00 Feb 4 20:00–24:00 Feb 5 19:00–24:00 Feb 6 00:00–01:00, 08:00–12:00 Feb 7 09:00–16:00, 18:00–20:00, 22:00–23:00 Feb 8 09:00–18:00 Feb 9 17:00–18:00, 20:00–24:00 Feb 10 08:00–10:00, 12:00–14:00, 20:00–21:00 Feb 11 22:00–23:00 Feb 12 14:00–15:00, 17:00–18:00 Feb 13 09:00–17:00, 20:00–21:00 Feb 16 19:00–21:00 Feb 17 18:00–20:00 Feb 18 19:00–20:00 Feb 19 08:00–14:00, 17:00–22:00 Feb 20 08:00–14:00 Feb 22 20:00–22:00 Feb 23 21:00–23:00 Feb 24 21:00–23:00 Feb 26 21:00–22:00
March
Mar 7 22:00–24:00 Mar 8 05:00–08:00, 18:00–21:00 Mar 9 21:00–23:00 Mar 10 17:00–18:00, 20:00–23:00 Mar 11 17:00–21:00 Mar 12 08:00–14:00 Mar 13 08:00–16:00, 21:00–24:00 Mar 14 22:00–23:00 Mar 15 20:00–22:00 Mar 16 20:00–21:00 Mar 17 20:00–22:00 Mar 18 20:00–21:00 Mar 19 09:00–12:00, 15:00–17:00 Mar 20 08:00–09:00 Mar 28 20:00–24:00 Mar 29 07:00–10:00, 12:00–14:00, 21:00–22:00 Mar 30 18:00–21:00 Mar 31 18:00–21:00
April
Apr 1 17:00–20:00 Apr 2 07:00–08:00, 12:00–17:00 Apr 3 08:00–10:00, 12:00–15:00 Apr 5 14:00–17:00 Apr 6 10:00–12:00, 20:00–21:00 Apr 7 11:00–16:00 Apr 8 21:00–22:00 Apr 10 07:00–09:00, 12:00–13:00, 16:00–17:00 Apr 12 19:00–20:00 Apr 13 18:00–21:00 Apr 14 17:00–20:00 Apr 15 18:00–19:00, 21:00–22:00 Apr 16 07:00–10:00, 17:00–18:00, 21:00–22:00 Apr 17 05:00–06:00, 10:00–15:00 Apr 19 19:00–20:00 Apr 20 19:00–20:00 Apr 21 07:00–11:00 Apr 22 19:00–20:00 Apr 23 20:00–21:00 Apr 24 07:00–10:00, 15:00–17:00 Apr 25 17:00–21:00 Apr 26 09:00–11:00, 13:00–14:00 Apr 27 17:00–21:00 Apr 29 22:00–23:00 Apr 30 07:00–08:00, 15:00–16:00
May
May 1 08:00–09:00, 17:00–19:00 May 2 07:00–08:00 May 3 09:00–10:00 May 4 19:00–22:00 May 5 17:00–21:00 May 6 20:00–21:00 May 7 08:00–10:00 May 8 23:00–24:00 May 10 19:00–24:00 May 11 19:00–24:00 May 13 17:00–20:00 May 14 12:00–14:00, 19:00–20:00 May 15 07:00–09:00, 16:00–17:00, 19:00–21:00 May 16 16:00–17:00 May 17 08:00–13:00, 18:00–19:00 May 18 20:00–21:00 May 19 19:00–20:00 May 20 20:00–22:00 May 21 06:00–13:00 May 22 08:00–11:00, 13:00–14:00 May 23 21:00–22:00 May 24 21:00–22:00 May 26 16:00–17:00, 20:00–22:00 May 27 16:00–20:00 May 28 06:00–10:00, 13:00–14:00 May 29 08:00–10:00 May 30 09:00–13:00, 21:00–23:00 May 31 07:00–11:00, 16:00–21:00
June
Jun 2 11:00–13:00, 15:00–17:00, 21:00–23:00 Jun 3 21:00–23:00 Jun 4 17:00–18:00, 23:00–24:00 Jun 5 00:00–01:00, 22:00–24:00 Jun 6 23:00–24:00 Jun 7 00:00–01:00 Jun 9 20:00–24:00 Jun 10 08:00–14:00 Jun 11 06:00–09:00, 12:00–15:00 Jun 12 11:00–12:00, 18:00–19:00 Jun 13 08:00–14:00 Jun 15 06:00–08:00, 11:00–14:00 Jun 16 16:00–17:00 Jun 17 16:00–17:00 Jun 18 07:00–08:00, 10:00–11:00, 14:00–15:00 Jun 19 10:00–15:00 Jun 20 13:00–14:00 Jun 21 21:00–23:00 Jun 22 10:00–11:00, 15:00–17:00, 19:00–20:00 Jun 23 08:00–12:00 Jun 24 18:00–21:00 Jun 25 17:00–18:00, 22:00–23:00 Jun 26 06:00–14:00 Jun 27 11:00–16:00 Jun 28 13:00–14:00, 17:00–19:00 Jun 29 07:00–08:00 Jun 30 15:00–17:00
July
Jul 2 17:00–18:00, 21:00–23:00 Jul 3 06:00–09:00, 11:00–13:00 Jul 4 17:00–18:00 Jul 5 10:00–11:00, 15:00–18:00, 21:00–22:00 Jul 6 18:00–19:00 Jul 7 19:00–20:00, 23:00–24:00 Jul 8 00:00–01:00, 17:00–18:00 Jul 10 17:00–19:00, 22:00–24:00 Jul 11 16:00–17:00, 20:00–22:00 Jul 12 21:00–24:00 Jul 13 00:00–01:00, 16:00–20:00, 22:00–24:00 Jul 14 23:00–24:00 Jul 15 00:00–01:00, 16:00–18:00, 20:00–23:00 Jul 16 16:00–19:00 Jul 17 07:00–09:00, 13:00–15:00 Jul 25 20:00–23:00 Jul 26 20:00–21:00