Most often in March, 31 days.
Highest follower count seen that year: 3,304.
January
Jan 1 15:00–17:00 Jan 2 14:00–19:00 Jan 3 13:00–17:00, 19:00–21:00 Jan 4 13:00–16:00, 18:00–21:00 Jan 5 14:00–23:00 Jan 6 15:00–20:00 Jan 7 14:00–15:00, 18:00–20:00 Jan 8 12:00–17:00 Jan 9 16:00–19:00 Jan 10 15:00–17:00 Jan 11 15:00–16:00 Jan 12 13:00–16:00, 19:00–20:00 Jan 13 14:00–18:00 Jan 14 08:00–12:00 Jan 15 12:00–16:00 Jan 16 10:00–17:00, 19:00–20:00 Jan 17 10:00–19:00 Jan 18 12:00–21:00 Jan 19 16:00–22:00 Jan 20 16:00–19:00, 21:00–22:00 Jan 21 14:00–15:00 Jan 22 10:00–11:00, 18:00–19:00 Jan 23 14:00–19:00, 23:00–24:00 Jan 24 00:00–01:00, 14:00–19:00 Jan 25 23:00–24:00 Jan 26 10:00–15:00 Jan 27 18:00–21:00 Jan 28 14:00–15:00, 17:00–20:00 Jan 29 16:00–20:00 Jan 30 16:00–20:00 Jan 31 12:00–19:00
February
Feb 1 17:00–19:00, 21:00–23:00 Feb 2 17:00–18:00 Feb 3 08:00–09:00, 13:00–14:00, 21:00–22:00 Feb 4 16:00–20:00 Feb 5 13:00–14:00, 21:00–24:00 Feb 6 09:00–10:00, 13:00–14:00, 18:00–20:00 Feb 8 17:00–19:00, 21:00–22:00 Feb 9 14:00–17:00, 20:00–21:00 Feb 10 18:00–20:00, 23:00–24:00 Feb 11 00:00–01:00, 15:00–16:00 Feb 12 08:00–09:00, 22:00–23:00 Feb 13 22:00–23:00 Feb 14 01:00–02:00, 12:00–14:00, 17:00–19:00 Feb 15 14:00–16:00 Feb 16 20:00–24:00 Feb 17 08:00–10:00, 14:00–16:00 Feb 20 10:00–12:00, 14:00–17:00 Feb 21 11:00–12:00 Feb 22 08:00–10:00, 12:00–13:00 Feb 23 10:00–12:00, 16:00–19:00 Feb 24 07:00–10:00, 14:00–15:00 Feb 25 08:00–10:00, 12:00–13:00 Feb 26 09:00–12:00, 16:00–17:00 Feb 27 11:00–12:00, 15:00–20:00 Feb 28 12:00–19:00
March
Mar 1 13:00–16:00 Mar 2 08:00–09:00, 14:00–15:00, 17:00–19:00 Mar 3 16:00–17:00, 19:00–20:00 Mar 4 12:00–19:00 Mar 5 12:00–18:00 Mar 6 13:00–21:00 Mar 7 14:00–18:00, 22:00–23:00 Mar 8 16:00–19:00 Mar 9 16:00–17:00 Mar 10 11:00–12:00, 19:00–21:00 Mar 11 16:00–17:00 Mar 12 13:00–18:00, 23:00–24:00 Mar 13 00:00–02:00, 18:00–23:00 Mar 14 16:00–22:00 Mar 15 17:00–18:00, 22:00–24:00 Mar 16 17:00–21:00 Mar 17 13:00–15:00 Mar 18 23:00–24:00 Mar 19 09:00–10:00 Mar 20 09:00–10:00 Mar 21 12:00–17:00 Mar 22 21:00–24:00 Mar 23 00:00–02:00, 08:00–10:00, 13:00–14:00 Mar 24 00:00–02:00, 08:00–14:00 Mar 25 02:00–03:00, 07:00–12:00, 15:00–16:00, 20:00–21:00 Mar 26 10:00–11:00, 17:00–20:00 Mar 27 09:00–20:00 Mar 28 08:00–10:00, 14:00–18:00 Mar 29 08:00–10:00, 12:00–16:00 Mar 30 08:00–13:00, 17:00–20:00 Mar 31 10:00–11:00, 16:00–20:00
April
Apr 1 09:00–10:00, 12:00–16:00 Apr 2 09:00–13:00, 15:00–16:00 Apr 3 09:00–16:00 Apr 4 13:00–14:00 Apr 5 15:00–18:00, 20:00–21:00 Apr 6 12:00–24:00 Apr 7 13:00–18:00, 20:00–21:00 Apr 8 11:00–21:00 Apr 9 07:00–08:00, 13:00–15:00 Apr 10 10:00–13:00, 15:00–17:00, 19:00–20:00 Apr 11 10:00–20:00 Apr 12 13:00–14:00, 16:00–21:00 Apr 13 13:00–18:00 Apr 14 08:00–13:00, 17:00–18:00 Apr 15 09:00–14:00, 18:00–22:00 Apr 16 12:00–13:00, 16:00–21:00 Apr 17 12:00–18:00 Apr 18 14:00–18:00 Apr 19 16:00–21:00 Apr 20 11:00–15:00, 18:00–21:00 Apr 21 17:00–18:00 Apr 22 13:00–20:00 Apr 23 16:00–21:00 Apr 24 18:00–22:00 Apr 25 11:00–14:00, 19:00–22:00 Apr 26 17:00–18:00 Apr 27 16:00–22:00 Apr 28 19:00–22:00 Apr 29 12:00–16:00, 18:00–19:00 Apr 30 13:00–15:00
May
May 1 15:00–17:00 May 3 14:00–15:00, 17:00–20:00 May 4 06:00–09:00 May 5 19:00–23:00 May 6 06:00–09:00 May 7 02:00–04:00, 06:00–08:00, 20:00–21:00 May 8 23:00–24:00 May 9 06:00–07:00, 11:00–12:00 May 10 08:00–10:00 May 11 08:00–09:00, 21:00–22:00 May 12 08:00–09:00 May 13 08:00–11:00, 14:00–17:00 May 14 09:00–10:00 May 15 08:00–09:00, 12:00–13:00 May 16 07:00–12:00 May 17 08:00–09:00 May 18 11:00–12:00 May 19 14:00–16:00 May 20 10:00–11:00 May 22 19:00–20:00 May 23 15:00–19:00 May 24 14:00–22:00 May 25 12:00–24:00 May 26 17:00–21:00 May 27 13:00–24:00 May 28 00:00–01:00, 10:00–19:00, 22:00–23:00 May 29 12:00–20:00 May 30 13:00–21:00 May 31 12:00–23:00
June
Jun 1 01:00–02:00, 15:00–21:00 Jun 2 15:00–23:00 Jun 3 01:00–02:00, 13:00–14:00, 18:00–22:00 Jun 4 11:00–15:00, 17:00–18:00 Jun 5 13:00–17:00 Jun 6 01:00–02:00, 04:00–05:00, 12:00–15:00, 22:00–24:00 Jun 7 17:00–23:00 Jun 8 00:00–01:00, 14:00–19:00 Jun 9 07:00–10:00 Jun 10 08:00–09:00 Jun 11 06:00–07:00 Jun 12 08:00–10:00, 20:00–21:00 Jun 15 06:00–08:00 Jun 16 09:00–14:00 Jun 17 08:00–11:00 Jun 18 07:00–13:00 Jun 19 06:00–07:00, 11:00–14:00, 20:00–21:00 Jun 20 06:00–15:00 Jun 21 07:00–11:00, 14:00–16:00, 19:00–20:00, 22:00–23:00 Jun 22 07:00–08:00, 10:00–19:00, 22:00–23:00 Jun 23 07:00–11:00, 17:00–19:00 Jun 24 08:00–16:00 Jun 25 07:00–11:00, 13:00–17:00 Jun 26 09:00–13:00, 18:00–19:00 Jun 27 11:00–16:00 Jun 28 10:00–14:00, 19:00–20:00 Jun 29 11:00–17:00 Jun 30 08:00–10:00, 15:00–17:00
July
Jul 1 07:00–14:00, 17:00–18:00 Jul 2 14:00–15:00 Jul 3 08:00–15:00, 17:00–18:00 Jul 4 10:00–12:00 Jul 5 14:00–15:00, 17:00–18:00 Jul 6 10:00–15:00, 19:00–21:00 Jul 8 07:00–09:00, 11:00–14:00, 20:00–21:00 Jul 9 11:00–16:00 Jul 10 11:00–16:00, 20:00–23:00 Jul 11 10:00–19:00, 23:00–24:00 Jul 12 12:00–20:00 Jul 13 12:00–19:00 Jul 14 09:00–21:00 Jul 15 12:00–22:00 Jul 16 13:00–18:00, 20:00–24:00 Jul 17 10:00–14:00, 18:00–20:00 Jul 18 11:00–16:00, 20:00–21:00 Jul 19 11:00–12:00, 14:00–23:00 Jul 20 11:00–14:00, 18:00–22:00 Jul 21 02:00–03:00, 11:00–12:00, 15:00–20:00 Jul 22 13:00–16:00, 18:00–19:00 Jul 23 13:00–17:00, 19:00–21:00 Jul 24 00:00–01:00, 13:00–15:00 Jul 25 13:00–18:00 Jul 26 13:00–15:00, 18:00–19:00 Jul 27 14:00–15:00