Most often in March, 29 days.
Highest follower count seen that year: 68,535.
January
Jan 3 09:00–13:00, 17:00–19:00 Jan 4 09:00–12:00, 16:00–19:00 Jan 5 10:00–13:00 Jan 6 11:00–15:00, 17:00–20:00 Jan 7 11:00–14:00 Jan 8 10:00–13:00 Jan 9 10:00–13:00 Jan 10 11:00–14:00 Jan 11 08:00–11:00, 17:00–20:00 Jan 12 11:00–16:00 Jan 13 10:00–13:00 Jan 14 10:00–13:00, 18:00–20:00 Jan 15 10:00–12:00 Jan 16 09:00–13:00, 17:00–20:00 Jan 17 11:00–13:00, 16:00–18:00 Jan 18 10:00–13:00, 17:00–19:00 Jan 19 10:00–14:00 Jan 20 10:00–12:00, 17:00–20:00 Jan 22 09:00–12:00, 16:00–19:00 Jan 23 08:00–12:00 Jan 24 11:00–14:00 Jan 25 10:00–13:00, 17:00–20:00 Jan 26 10:00–13:00, 17:00–20:00 Jan 27 13:00–15:00 Jan 28 09:00–12:00, 18:00–21:00 Jan 29 10:00–12:00, 18:00–20:00 Jan 30 09:00–12:00, 16:00–19:00 Jan 31 09:00–11:00
February
Feb 1 09:00–12:00, 17:00–20:00 Feb 2 15:00–18:00 Feb 3 07:00–10:00 Feb 4 10:00–13:00, 16:00–19:00 Feb 5 10:00–13:00 Feb 6 07:00–11:00 Feb 7 10:00–13:00, 17:00–19:00 Feb 8 17:00–20:00 Feb 9 09:00–12:00, 16:00–19:00 Feb 10 08:00–11:00 Feb 12 08:00–11:00, 16:00–17:00 Feb 13 08:00–09:00, 16:00–20:00 Feb 14 09:00–13:00, 17:00–20:00 Feb 15 07:00–12:00 Feb 16 08:00–12:00 Feb 17 08:00–11:00, 14:00–16:00 Feb 18 09:00–12:00 Feb 19 08:00–11:00, 15:00–17:00 Feb 20 09:00–12:00, 15:00–19:00 Feb 21 08:00–14:00 Feb 22 08:00–11:00, 17:00–20:00 Feb 23 10:00–13:00, 17:00–19:00 Feb 24 09:00–11:00 Feb 25 08:00–11:00 Feb 26 09:00–12:00 Feb 27 09:00–12:00 Feb 28 07:00–11:00, 15:00–19:00
March
Mar 1 11:00–14:00, 17:00–21:00 Mar 2 08:00–12:00, 17:00–19:00 Mar 3 09:00–12:00, 16:00–19:00 Mar 4 10:00–13:00 Mar 5 08:00–11:00 Mar 6 07:00–11:00, 15:00–20:00 Mar 7 08:00–11:00, 16:00–20:00 Mar 8 07:00–10:00 Mar 10 08:00–12:00 Mar 11 08:00–12:00, 15:00–19:00 Mar 12 09:00–12:00 Mar 13 10:00–12:00 Mar 14 12:00–20:00 Mar 15 16:00–20:00 Mar 16 08:00–11:00, 17:00–20:00 Mar 17 08:00–11:00, 16:00–19:00 Mar 18 08:00–11:00 Mar 19 08:00–12:00 Mar 20 08:00–11:00, 15:00–19:00 Mar 21 09:00–12:00, 18:00–20:00 Mar 22 07:00–10:00, 18:00–22:00 Mar 23 09:00–11:00, 18:00–21:00 Mar 25 10:00–12:00, 17:00–21:00 Mar 26 14:00–16:00 Mar 27 08:00–10:00, 17:00–19:00 Mar 28 09:00–12:00, 17:00–20:00 Mar 29 08:00–11:00 Mar 30 10:00–13:00, 18:00–21:00 Mar 31 09:00–12:00
April
Apr 4 16:00–18:00 Apr 5 12:00–13:00, 17:00–19:00 Apr 6 09:00–12:00, 16:00–20:00 Apr 7 08:00–11:00, 17:00–20:00 Apr 8 09:00–12:00, 17:00–21:00 Apr 9 09:00–14:00, 17:00–19:00 Apr 10 08:00–11:00 Apr 11 10:00–13:00, 18:00–20:00 Apr 12 10:00–12:00 Apr 13 09:00–13:00 Apr 14 10:00–13:00, 17:00–20:00 Apr 16 17:00–20:00 Apr 17 07:00–11:00, 15:00–20:00 Apr 19 09:00–12:00, 16:00–19:00 Apr 22 08:00–11:00 Apr 23 09:00–15:00 Apr 24 09:00–12:00, 16:00–19:00 Apr 26 16:00–21:00 Apr 27 09:00–15:00 Apr 28 09:00–13:00 Apr 29 10:00–15:00 Apr 30 08:00–11:00, 14:00–18:00
May
May 1 10:00–13:00, 16:00–19:00 May 2 09:00–12:00, 15:00–18:00 May 3 09:00–12:00, 17:00–19:00 May 4 09:00–13:00, 17:00–19:00 May 6 10:00–13:00 May 7 15:00–19:00 May 8 10:00–13:00, 18:00–21:00 May 9 09:00–15:00 May 10 16:00–21:00 May 11 12:00–16:00 May 12 17:00–21:00 May 13 18:00–21:00 May 14 06:00–10:00, 14:00–18:00 May 15 11:00–14:00, 18:00–20:00 May 16 15:00–18:00 May 17 10:00–17:00 May 18 10:00–12:00 May 21 18:00–22:00 May 22 10:00–13:00, 16:00–19:00 May 23 12:00–17:00 May 25 11:00–15:00, 19:00–21:00 May 26 10:00–16:00 May 27 08:00–13:00
June
Jun 2 16:00–21:00 Jun 3 11:00–13:00, 16:00–23:00 Jun 5 10:00–17:00 Jun 6 07:00–10:00, 15:00–21:00 Jun 7 15:00–21:00 Jun 8 09:00–12:00, 18:00–21:00 Jun 9 09:00–16:00 Jun 10 18:00–21:00 Jun 11 12:00–19:00 Jun 12 07:00–13:00 Jun 13 08:00–16:00 Jun 15 15:00–21:00 Jun 16 07:00–10:00, 15:00–19:00 Jun 17 07:00–12:00 Jun 18 10:00–15:00 Jun 20 15:00–19:00 Jun 21 09:00–16:00 Jun 23 11:00–18:00 Jun 24 09:00–12:00, 14:00–18:00 Jun 25 16:00–18:00 Jun 26 12:00–16:00 Jun 27 11:00–14:00 Jun 28 08:00–15:00 Jun 29 12:00–14:00, 16:00–20:00 Jun 30 13:00–16:00
July
Jul 2 12:00–18:00 Jul 3 08:00–15:00 Jul 4 09:00–13:00, 15:00–20:00 Jul 5 10:00–18:00 Jul 6 07:00–11:00, 14:00–18:00 Jul 7 07:00–13:00, 18:00–20:00 Jul 8 07:00–09:00, 14:00–19:00 Jul 9 05:00–10:00 Jul 10 11:00–14:00 Jul 11 10:00–17:00 Jul 12 08:00–13:00, 15:00–18:00 Jul 13 11:00–15:00 Jul 14 08:00–12:00, 16:00–19:00 Jul 15 08:00–12:00, 16:00–18:00 Jul 16 15:00–17:00 Jul 17 08:00–11:00, 15:00–20:00 Jul 18 11:00–16:00, 18:00–20:00 Jul 19 08:00–13:00, 17:00–21:00 Jul 20 08:00–14:00 Jul 21 07:00–13:00, 16:00–19:00 Jul 23 10:00–12:00, 16:00–20:00 Jul 24 08:00–12:00, 15:00–19:00 Jul 25 08:00–10:00, 13:00–16:00 Jul 26 17:00–21:00 Jul 27 10:00–17:00