Most often in March, 30 days.
Highest follower count seen that year: 4,588.
January
Jan 15 19:00–22:00 Jan 16 08:00–10:00, 18:00–23:00 Jan 17 09:00–13:00, 20:00–23:00 Jan 18 08:00–14:00, 22:00–24:00 Jan 19 09:00–10:00, 21:00–23:00 Jan 20 09:00–15:00, 18:00–23:00 Jan 21 20:00–22:00 Jan 22 07:00–09:00, 18:00–22:00 Jan 23 08:00–11:00 Jan 24 09:00–12:00 Jan 25 09:00–11:00 Jan 27 08:00–12:00 Jan 28 10:00–11:00 Jan 30 08:00–12:00 Jan 31 20:00–21:00
February
Feb 1 00:00–02:00, 11:00–14:00, 22:00–23:00 Feb 2 17:00–19:00 Feb 3 10:00–23:00 Feb 4 17:00–24:00 Feb 5 18:00–20:00 Feb 6 08:00–14:00, 21:00–23:00 Feb 7 10:00–14:00, 18:00–20:00 Feb 8 08:00–10:00 Feb 9 17:00–20:00, 22:00–23:00 Feb 10 08:00–10:00, 15:00–19:00, 21:00–23:00 Feb 11 07:00–11:00 Feb 12 08:00–11:00 Feb 15 19:00–24:00 Feb 16 10:00–14:00, 16:00–18:00, 20:00–23:00 Feb 17 09:00–13:00, 22:00–24:00 Feb 18 20:00–23:00 Feb 19 09:00–10:00, 18:00–22:00 Feb 20 07:00–22:00 Feb 21 11:00–14:00 Feb 22 09:00–14:00, 22:00–24:00 Feb 23 17:00–18:00, 20:00–22:00 Feb 24 08:00–10:00, 15:00–18:00, 20:00–22:00 Feb 25 08:00–14:00, 18:00–22:00 Feb 26 08:00–11:00 Feb 27 10:00–16:00, 19:00–21:00 Feb 28 10:00–13:00, 15:00–18:00
March
Mar 1 02:00–03:00, 09:00–12:00, 16:00–22:00 Mar 3 07:00–10:00, 16:00–17:00, 19:00–23:00 Mar 4 08:00–10:00, 19:00–22:00 Mar 5 10:00–12:00 Mar 6 09:00–12:00 Mar 7 08:00–14:00 Mar 8 09:00–16:00, 23:00–24:00 Mar 9 08:00–10:00, 17:00–18:00 Mar 10 07:00–10:00, 15:00–19:00 Mar 11 05:00–10:00, 16:00–20:00 Mar 12 07:00–13:00, 15:00–18:00, 21:00–22:00 Mar 13 08:00–15:00, 21:00–23:00 Mar 14 09:00–12:00 Mar 15 09:00–14:00, 16:00–17:00, 22:00–24:00 Mar 16 09:00–14:00, 18:00–20:00 Mar 17 07:00–10:00, 20:00–22:00 Mar 18 07:00–10:00 Mar 19 08:00–13:00, 16:00–17:00, 20:00–21:00 Mar 20 09:00–23:00 Mar 21 09:00–13:00, 22:00–23:00 Mar 22 09:00–14:00, 16:00–23:00 Mar 23 20:00–24:00 Mar 24 10:00–13:00, 15:00–22:00 Mar 25 07:00–10:00, 22:00–24:00 Mar 26 09:00–15:00, 17:00–23:00 Mar 27 09:00–11:00, 22:00–23:00 Mar 28 08:00–10:00 Mar 29 11:00–24:00 Mar 30 20:00–23:00 Mar 31 09:00–10:00, 16:00–23:00
April
Apr 1 07:00–21:00 Apr 2 08:00–13:00, 16:00–19:00, 21:00–23:00 Apr 3 11:00–17:00 Apr 4 08:00–14:00 Apr 5 10:00–13:00, 15:00–22:00 Apr 7 07:00–13:00 Apr 8 08:00–12:00, 19:00–21:00 Apr 9 10:00–14:00 Apr 10 09:00–12:00 Apr 13 12:00–19:00, 21:00–22:00 Apr 14 09:00–13:00, 16:00–22:00 Apr 15 09:00–13:00 Apr 16 08:00–17:00 Apr 21 08:00–13:00, 17:00–22:00 Apr 22 10:00–12:00 Apr 23 09:00–12:00, 20:00–24:00 Apr 24 10:00–15:00, 17:00–22:00 Apr 25 09:00–15:00, 18:00–20:00 Apr 26 12:00–15:00 Apr 27 09:00–13:00 Apr 28 09:00–13:00 Apr 29 09:00–14:00, 17:00–22:00 Apr 30 09:00–14:00, 18:00–23:00
May
May 1 09:00–10:00 May 3 12:00–14:00, 23:00–24:00 May 4 16:00–22:00 May 5 10:00–12:00, 21:00–23:00 May 6 09:00–13:00, 16:00–17:00 May 7 07:00–13:00, 17:00–19:00 May 8 10:00–14:00 May 9 08:00–13:00, 19:00–24:00 May 10 09:00–13:00, 19:00–24:00 May 11 10:00–14:00, 16:00–23:00 May 12 10:00–14:00 May 13 08:00–15:00 May 14 11:00–14:00 May 15 11:00–14:00, 17:00–20:00, 22:00–23:00 May 16 10:00–19:00, 21:00–22:00 May 17 11:00–16:00, 19:00–23:00 May 18 11:00–17:00, 20:00–23:00 May 19 10:00–22:00 May 20 11:00–12:00 May 21 10:00–13:00, 21:00–22:00 May 22 09:00–11:00, 21:00–22:00 May 23 10:00–12:00 May 24 08:00–14:00, 21:00–23:00 May 25 17:00–22:00 May 26 08:00–09:00, 16:00–22:00 May 27 09:00–12:00 May 28 09:00–15:00, 17:00–22:00 May 29 08:00–09:00 May 31 19:00–24:00
June
Jun 1 19:00–23:00 Jun 2 07:00–09:00 Jun 3 08:00–10:00, 18:00–23:00 Jun 4 10:00–16:00, 19:00–24:00 Jun 5 08:00–10:00, 15:00–16:00, 21:00–24:00 Jun 6 09:00–13:00 Jun 7 10:00–20:00 Jun 8 20:00–22:00 Jun 9 18:00–23:00 Jun 10 00:00–01:00, 12:00–20:00, 22:00–24:00 Jun 11 08:00–10:00, 20:00–24:00 Jun 12 09:00–10:00 Jun 13 09:00–13:00, 17:00–19:00 Jun 15 11:00–22:00 Jun 16 09:00–10:00, 18:00–23:00 Jun 17 08:00–09:00 Jun 18 11:00–13:00, 18:00–22:00 Jun 19 11:00–14:00, 17:00–22:00 Jun 20 11:00–13:00 Jun 21 08:00–15:00, 17:00–18:00, 20:00–24:00 Jun 22 19:00–21:00 Jun 23 10:00–15:00 Jun 24 09:00–14:00, 17:00–22:00 Jun 27 13:00–16:00 Jun 28 10:00–14:00 Jun 29 13:00–15:00 Jun 30 10:00–11:00, 20:00–22:00
July
Jul 1 10:00–12:00, 19:00–24:00 Jul 2 09:00–12:00 Jul 4 11:00–13:00 Jul 6 11:00–12:00, 20:00–22:00 Jul 7 09:00–11:00 Jul 8 09:00–12:00, 19:00–22:00 Jul 9 19:00–24:00 Jul 10 09:00–15:00, 17:00–23:00 Jul 11 11:00–17:00, 20:00–23:00 Jul 12 12:00–16:00, 18:00–19:00, 21:00–22:00 Jul 13 11:00–13:00 Jul 14 08:00–12:00, 23:00–24:00 Jul 15 12:00–17:00, 20:00–24:00 Jul 16 09:00–15:00, 18:00–21:00 Jul 17 10:00–15:00 Jul 18 12:00–17:00 Jul 19 13:00–16:00, 19:00–22:00 Jul 20 12:00–17:00, 19:00–23:00 Jul 21 00:00–02:00, 11:00–12:00 Jul 22 07:00–12:00, 18:00–24:00 Jul 24 09:00–12:00 Jul 25 11:00–12:00 Jul 27 10:00–12:00, 20:00–21:00