Most often in March, 31 days.
Highest follower count seen that year: 3,585.
January
Jan 31 13:00–17:00, 21:00–23:00
February
Feb 1 19:00–22:00 Feb 2 13:00–18:00, 20:00–22:00 Feb 3 10:00–11:00, 13:00–15:00, 17:00–19:00 Feb 4 09:00–15:00, 20:00–21:00 Feb 5 09:00–14:00 Feb 6 20:00–22:00 Feb 7 22:00–24:00 Feb 8 20:00–23:00 Feb 9 14:00–16:00 Feb 10 22:00–24:00 Feb 11 00:00–04:00 Feb 12 00:00–03:00, 12:00–15:00, 23:00–24:00 Feb 13 00:00–01:00, 21:00–24:00 Feb 14 23:00–24:00 Feb 15 00:00–02:00, 10:00–12:00, 22:00–24:00 Feb 16 00:00–01:00, 18:00–20:00 Feb 17 22:00–24:00 Feb 18 00:00–02:00, 13:00–14:00, 22:00–24:00 Feb 19 00:00–01:00, 09:00–11:00, 22:00–24:00 Feb 20 00:00–02:00, 21:00–24:00 Feb 21 00:00–02:00, 08:00–11:00, 13:00–18:00, 22:00–24:00 Feb 22 00:00–02:00, 23:00–24:00 Feb 23 00:00–02:00, 22:00–24:00 Feb 24 00:00–01:00, 21:00–24:00 Feb 25 00:00–01:00, 12:00–19:00, 23:00–24:00 Feb 26 00:00–01:00, 08:00–11:00, 13:00–18:00, 23:00–24:00 Feb 27 00:00–02:00, 08:00–15:00, 17:00–24:00 Feb 28 00:00–02:00, 09:00–16:00, 19:00–23:00
March
Mar 1 00:00–01:00, 09:00–16:00, 20:00–21:00, 23:00–24:00 Mar 2 00:00–02:00, 17:00–24:00 Mar 3 00:00–01:00, 18:00–21:00 Mar 4 13:00–17:00, 21:00–24:00 Mar 5 00:00–01:00, 13:00–14:00, 23:00–24:00 Mar 6 12:00–18:00, 20:00–24:00 Mar 7 00:00–01:00, 09:00–24:00 Mar 8 00:00–02:00, 08:00–10:00, 12:00–16:00, 20:00–24:00 Mar 9 00:00–01:00, 09:00–18:00, 22:00–24:00 Mar 10 00:00–01:00, 10:00–18:00, 21:00–24:00 Mar 11 09:00–10:00, 13:00–18:00, 22:00–24:00 Mar 12 00:00–01:00, 09:00–14:00, 16:00–18:00, 21:00–24:00 Mar 13 03:00–04:00, 10:00–11:00, 13:00–18:00, 21:00–24:00 Mar 14 00:00–01:00, 10:00–16:00, 21:00–22:00 Mar 15 12:00–17:00 Mar 16 14:00–18:00 Mar 17 13:00–18:00, 21:00–24:00 Mar 18 07:00–17:00, 21:00–24:00 Mar 19 09:00–12:00, 14:00–18:00, 22:00–24:00 Mar 20 08:00–12:00, 14:00–17:00, 21:00–24:00 Mar 21 12:00–15:00, 17:00–20:00, 22:00–24:00 Mar 22 00:00–01:00, 09:00–10:00, 12:00–16:00, 22:00–23:00 Mar 23 09:00–10:00, 13:00–15:00 Mar 24 07:00–09:00, 15:00–19:00, 22:00–24:00 Mar 25 00:00–01:00, 11:00–18:00, 20:00–24:00 Mar 26 19:00–24:00 Mar 27 19:00–23:00 Mar 28 09:00–10:00, 14:00–16:00, 22:00–24:00 Mar 29 10:00–11:00, 14:00–17:00 Mar 30 12:00–17:00, 21:00–24:00 Mar 31 10:00–11:00, 15:00–16:00, 21:00–24:00
April
Apr 1 13:00–15:00, 20:00–23:00 Apr 2 14:00–18:00, 22:00–24:00 Apr 3 00:00–01:00, 11:00–16:00, 21:00–22:00 Apr 4 10:00–11:00, 13:00–17:00, 21:00–24:00 Apr 6 11:00–15:00, 21:00–22:00 Apr 7 00:00–01:00 Apr 8 10:00–20:00 Apr 9 12:00–16:00, 22:00–24:00 Apr 10 07:00–13:00, 20:00–23:00 Apr 11 08:00–10:00
May
May 20 16:00–18:00 May 21 22:00–24:00 May 22 01:00–02:00, 17:00–20:00 May 24 07:00–10:00, 13:00–16:00 May 25 14:00–15:00, 23:00–24:00 May 26 00:00–02:00, 09:00–11:00, 14:00–15:00 May 27 03:00–06:00, 10:00–11:00, 16:00–20:00 May 29 13:00–14:00, 17:00–18:00 May 30 07:00–11:00 May 31 10:00–13:00
June
Jun 2 22:00–24:00 Jun 3 09:00–11:00 Jun 4 06:00–13:00, 18:00–19:00 Jun 5 09:00–10:00, 12:00–16:00 Jun 6 08:00–11:00, 13:00–15:00, 17:00–18:00 Jun 8 11:00–13:00, 16:00–20:00 Jun 9 12:00–15:00 Jun 11 06:00–10:00, 14:00–15:00 Jun 12 14:00–16:00, 22:00–24:00 Jun 13 00:00–01:00, 11:00–14:00, 17:00–19:00 Jun 23 08:00–14:00 Jun 24 12:00–17:00 Jun 25 11:00–12:00 Jun 26 10:00–11:00, 13:00–14:00 Jun 27 09:00–11:00, 13:00–15:00, 18:00–19:00, 22:00–24:00 Jun 28 12:00–13:00 Jun 29 06:00–08:00 Jun 30 11:00–12:00
July
Jul 1 14:00–17:00 Jul 2 10:00–16:00 Jul 3 12:00–13:00 Jul 4 10:00–14:00 Jul 5 10:00–13:00, 16:00–17:00 Jul 7 15:00–17:00, 20:00–22:00 Jul 8 11:00–15:00, 21:00–23:00 Jul 9 10:00–12:00, 14:00–15:00 Jul 10 10:00–15:00 Jul 11 10:00–14:00, 20:00–22:00 Jul 12 09:00–10:00, 14:00–15:00 Jul 13 10:00–12:00, 15:00–17:00 Jul 14 13:00–14:00 Jul 15 10:00–14:00 Jul 17 11:00–13:00 Jul 19 09:00–11:00, 17:00–18:00 Jul 20 12:00–20:00 Jul 21 10:00–11:00, 13:00–19:00, 21:00–24:00 Jul 22 10:00–12:00, 14:00–15:00, 20:00–21:00