Most often in May, 31 days.
Highest follower count seen that year: 4,216.
February
Feb 11 12:00–21:00 Feb 12 11:00–16:00, 18:00–22:00 Feb 13 00:00–02:00, 11:00–16:00, 18:00–22:00 Feb 14 12:00–22:00 Feb 15 12:00–15:00, 17:00–21:00 Feb 16 11:00–15:00, 17:00–21:00 Feb 17 11:00–15:00, 17:00–21:00 Feb 18 12:00–15:00, 17:00–22:00 Feb 19 11:00–22:00 Feb 20 11:00–21:00 Feb 21 12:00–15:00, 17:00–22:00 Feb 22 11:00–15:00, 17:00–22:00 Feb 23 12:00–16:00, 18:00–21:00 Feb 24 11:00–21:00 Feb 25 11:00–16:00, 18:00–21:00 Feb 26 12:00–16:00, 18:00–21:00 Feb 27 11:00–22:00 Feb 28 11:00–15:00, 17:00–21:00
March
Mar 1 12:00–16:00, 18:00–21:00 Mar 2 11:00–15:00, 18:00–20:00 Mar 3 11:00–16:00, 19:00–22:00 Mar 4 11:00–21:00 Mar 5 11:00–15:00, 17:00–21:00 Mar 6 11:00–21:00 Mar 7 11:00–15:00, 17:00–21:00 Mar 8 11:00–15:00, 17:00–21:00 Mar 9 11:00–15:00, 18:00–21:00 Mar 11 14:00–16:00, 19:00–22:00 Mar 12 12:00–22:00 Mar 13 11:00–15:00, 18:00–22:00 Mar 14 11:00–16:00, 18:00–22:00 Mar 15 11:00–15:00, 17:00–20:00 Mar 16 10:00–15:00, 17:00–21:00 Mar 17 11:00–15:00, 17:00–21:00 Mar 18 11:00–18:00, 20:00–21:00 Mar 19 11:00–21:00 Mar 20 11:00–15:00, 17:00–19:00 Mar 21 11:00–15:00, 17:00–21:00 Mar 22 11:00–15:00, 17:00–21:00 Mar 23 11:00–15:00, 17:00–21:00 Mar 24 11:00–15:00, 17:00–21:00 Mar 25 11:00–22:00 Mar 26 11:00–21:00 Mar 27 11:00–15:00, 17:00–21:00 Mar 28 11:00–15:00, 17:00–21:00 Mar 29 10:00–21:00 Mar 30 11:00–15:00, 18:00–22:00 Mar 31 12:00–15:00, 17:00–22:00
April
Apr 1 11:00–15:00, 18:00–22:00 Apr 2 11:00–15:00, 18:00–22:00 Apr 3 11:00–15:00 Apr 4 11:00–21:00 Apr 5 11:00–15:00, 17:00–21:00 Apr 6 11:00–15:00, 17:00–21:00 Apr 7 11:00–15:00, 17:00–18:00, 20:00–21:00 Apr 8 11:00–15:00, 18:00–22:00 Apr 9 11:00–15:00 Apr 10 11:00–15:00, 18:00–21:00 Apr 11 10:00–15:00, 18:00–20:00 Apr 12 11:00–15:00, 18:00–21:00 Apr 13 11:00–21:00 Apr 14 11:00–15:00, 17:00–21:00 Apr 15 11:00–15:00, 18:00–22:00 Apr 16 14:00–16:00, 18:00–21:00 Apr 17 11:00–15:00, 17:00–21:00 Apr 18 11:00–16:00, 18:00–22:00 Apr 19 11:00–15:00, 17:00–21:00 Apr 20 11:00–15:00, 18:00–21:00 Apr 21 19:00–21:00 Apr 22 11:00–21:00 Apr 23 11:00–16:00, 18:00–22:00 Apr 24 11:00–13:00, 15:00–16:00, 18:00–22:00 Apr 25 11:00–16:00, 18:00–22:00 Apr 26 11:00–21:00 Apr 27 11:00–15:00, 17:00–22:00 Apr 28 12:00–15:00, 18:00–22:00 Apr 29 11:00–22:00 Apr 30 12:00–22:00
May
May 1 13:00–21:00 May 2 13:00–14:00, 19:00–20:00 May 3 12:00–22:00 May 4 11:00–21:00 May 5 11:00–22:00 May 6 10:00–13:00, 16:00–22:00 May 7 11:00–21:00 May 8 11:00–14:00, 18:00–22:00 May 9 12:00–16:00, 18:00–22:00 May 10 12:00–15:00, 17:00–21:00 May 11 10:00–16:00, 18:00–20:00 May 12 11:00–16:00, 18:00–22:00 May 13 11:00–15:00, 19:00–22:00 May 14 11:00–16:00, 19:00–21:00 May 15 12:00–15:00, 18:00–22:00 May 16 11:00–22:00 May 17 12:00–16:00, 18:00–22:00 May 18 10:00–16:00, 18:00–22:00 May 19 11:00–15:00, 18:00–22:00 May 20 11:00–16:00, 18:00–22:00 May 21 11:00–13:00, 17:00–21:00 May 22 10:00–16:00, 18:00–22:00 May 23 12:00–16:00, 18:00–19:00 May 24 11:00–15:00, 17:00–22:00 May 25 11:00–15:00, 18:00–21:00 May 26 11:00–16:00, 18:00–22:00 May 27 11:00–22:00 May 28 10:00–22:00 May 29 10:00–22:00 May 30 11:00–22:00 May 31 12:00–21:00
June
Jun 1 11:00–22:00 Jun 2 11:00–21:00 Jun 4 11:00–16:00, 19:00–23:00 Jun 5 12:00–16:00, 18:00–22:00 Jun 6 11:00–22:00 Jun 7 13:00–23:00 Jun 8 16:00–21:00 Jun 9 11:00–16:00, 18:00–22:00 Jun 10 12:00–22:00 Jun 11 11:00–16:00, 19:00–22:00 Jun 12 11:00–16:00, 18:00–21:00 Jun 15 11:00–15:00, 17:00–22:00 Jun 16 11:00–16:00, 18:00–20:00 Jun 17 11:00–21:00 Jun 18 11:00–21:00 Jun 19 11:00–21:00 Jun 20 12:00–16:00, 19:00–21:00 Jun 21 11:00–21:00 Jun 22 11:00–21:00 Jun 23 12:00–20:00 Jun 24 14:00–21:00 Jun 25 13:00–21:00 Jun 26 11:00–14:00, 18:00–21:00 Jun 27 11:00–16:00, 18:00–21:00 Jun 28 10:00–16:00, 18:00–21:00 Jun 29 11:00–16:00, 18:00–21:00 Jun 30 14:00–22:00
July
Jul 1 10:00–22:00 Jul 2 11:00–16:00, 18:00–21:00 Jul 3 11:00–22:00 Jul 4 10:00–21:00 Jul 5 11:00–21:00 Jul 6 11:00–16:00, 18:00–21:00 Jul 7 18:00–22:00 Jul 8 11:00–16:00, 19:00–22:00 Jul 9 10:00–22:00 Jul 10 11:00–22:00 Jul 11 12:00–16:00, 18:00–22:00 Jul 12 12:00–21:00 Jul 13 12:00–16:00, 18:00–21:00 Jul 14 11:00–22:00 Jul 15 12:00–23:00 Jul 16 11:00–16:00, 18:00–22:00 Jul 17 12:00–22:00 Jul 18 18:00–21:00 Jul 19 11:00–21:00 Jul 20 12:00–20:00, 22:00–24:00 Jul 21 00:00–01:00, 11:00–22:00 Jul 22 11:00–17:00, 20:00–23:00 Jul 23 12:00–22:00 Jul 24 00:00–01:00, 10:00–16:00, 18:00–20:00 Jul 26 12:00–15:00, 18:00–22:00 Jul 27 11:00–13:00, 14:00–15:00, 20:00–21:00 Jul 30 17:00–21:00