Most often in May, 27 days.
Highest follower count seen that year: 1,813.
January
Jan 1 12:00–14:00 Jan 2 09:00–11:00, 16:00–19:00 Jan 3 15:00–17:00 Jan 4 12:00–15:00 Jan 5 13:00–14:00 Jan 7 15:00–18:00 Jan 9 10:00–12:00 Jan 12 12:00–15:00 Jan 13 09:00–11:00, 22:00–23:00 Jan 14 17:00–20:00 Jan 15 19:00–21:00 Jan 16 11:00–13:00, 16:00–19:00, 23:00–24:00 Jan 17 10:00–13:00, 16:00–19:00 Jan 18 16:00–17:00, 19:00–22:00 Jan 19 13:00–15:00, 17:00–18:00, 20:00–22:00 Jan 20 10:00–12:00, 18:00–19:00 Jan 22 12:00–13:00 Jan 23 10:00–12:00, 15:00–16:00, 21:00–22:00 Jan 24 10:00–12:00 Jan 25 10:00–12:00, 14:00–15:00 Jan 26 09:00–10:00 Jan 27 10:00–12:00, 17:00–19:00 Jan 28 10:00–11:00, 15:00–17:00 Jan 30 10:00–11:00 Jan 31 09:00–12:00
February
Feb 3 07:00–10:00, 18:00–19:00 Feb 4 15:00–16:00 Feb 5 13:00–14:00 Feb 6 10:00–12:00, 19:00–20:00 Feb 8 08:00–10:00, 14:00–15:00 Feb 9 12:00–14:00 Feb 10 14:00–16:00 Feb 11 14:00–15:00 Feb 12 13:00–15:00 Feb 13 10:00–12:00 Feb 14 12:00–13:00, 18:00–20:00 Feb 15 09:00–12:00 Feb 16 10:00–13:00 Feb 17 07:00–09:00 Feb 18 14:00–17:00 Feb 19 12:00–15:00 Feb 20 09:00–11:00 Feb 21 12:00–15:00 Feb 22 07:00–11:00 Feb 23 09:00–13:00 Feb 24 07:00–10:00, 18:00–19:00 Feb 25 12:00–16:00 Feb 26 12:00–15:00 Feb 27 09:00–11:00 Feb 28 13:00–16:00
March
Mar 1 11:00–17:00 Mar 2 18:00–19:00 Mar 4 17:00–18:00, 20:00–22:00 Mar 5 09:00–11:00, 13:00–16:00 Mar 6 09:00–12:00, 17:00–19:00 Mar 7 09:00–10:00 Mar 9 10:00–14:00 Mar 10 10:00–12:00 Mar 11 12:00–13:00, 17:00–18:00 Mar 16 08:00–11:00, 18:00–20:00 Mar 17 08:00–10:00, 12:00–15:00, 18:00–20:00 Mar 18 09:00–12:00, 16:00–18:00 Mar 19 09:00–12:00 Mar 20 15:00–20:00 Mar 21 13:00–18:00 Mar 23 14:00–22:00 Mar 24 08:00–11:00, 14:00–16:00, 19:00–20:00 Mar 25 16:00–18:00 Mar 27 13:00–15:00 Mar 30 15:00–20:00 Mar 31 14:00–16:00
April
Apr 1 13:00–15:00 Apr 2 10:00–14:00, 18:00–21:00 Apr 3 07:00–10:00, 12:00–14:00 Apr 4 09:00–14:00 Apr 6 08:00–11:00, 14:00–16:00, 18:00–19:00 Apr 7 12:00–14:00, 17:00–18:00 Apr 8 09:00–10:00, 12:00–13:00 Apr 9 09:00–13:00 Apr 10 07:00–10:00, 12:00–13:00 Apr 11 08:00–12:00 Apr 13 08:00–11:00, 16:00–17:00 Apr 15 15:00–17:00 Apr 16 14:00–16:00, 18:00–19:00 Apr 17 10:00–11:00, 16:00–18:00 Apr 18 09:00–11:00 Apr 20 07:00–10:00, 12:00–14:00 Apr 21 12:00–13:00, 18:00–19:00 Apr 22 09:00–13:00 Apr 23 09:00–13:00 Apr 25 13:00–14:00 Apr 26 11:00–12:00 Apr 27 08:00–12:00, 14:00–16:00 Apr 28 14:00–18:00 Apr 30 13:00–16:00
May
May 1 09:00–10:00, 13:00–15:00 May 3 16:00–18:00 May 4 08:00–10:00, 15:00–17:00 May 5 14:00–16:00, 19:00–20:00 May 6 18:00–20:00 May 7 10:00–11:00, 17:00–21:00 May 8 13:00–15:00, 17:00–21:00 May 10 13:00–14:00, 16:00–17:00, 20:00–23:00 May 11 11:00–13:00, 17:00–20:00 May 12 11:00–13:00, 17:00–21:00 May 13 09:00–10:00, 15:00–17:00, 19:00–20:00 May 14 18:00–20:00 May 15 10:00–11:00, 13:00–14:00 May 16 12:00–14:00, 19:00–20:00 May 18 13:00–20:00 May 19 09:00–11:00, 15:00–16:00 May 21 16:00–17:00 May 22 08:00–11:00, 16:00–17:00 May 23 08:00–11:00, 15:00–18:00 May 24 13:00–17:00 May 25 14:00–16:00, 18:00–21:00 May 26 16:00–22:00 May 27 17:00–22:00 May 28 12:00–17:00, 20:00–21:00 May 29 14:00–20:00 May 30 11:00–13:00 May 31 10:00–13:00, 15:00–18:00
June
Jun 2 12:00–16:00, 18:00–19:00 Jun 3 12:00–14:00 Jun 4 08:00–10:00, 17:00–18:00, 20:00–22:00 Jun 5 11:00–14:00 Jun 8 09:00–11:00, 15:00–17:00 Jun 9 11:00–12:00, 15:00–18:00 Jun 11 13:00–16:00 Jun 12 08:00–11:00, 14:00–16:00 Jun 13 07:00–12:00 Jun 15 06:00–11:00 Jun 16 07:00–10:00, 16:00–18:00 Jun 17 13:00–14:00 Jun 18 06:00–11:00 Jun 20 07:00–11:00 Jun 22 07:00–15:00 Jun 23 11:00–15:00 Jun 24 06:00–09:00, 11:00–13:00 Jun 25 07:00–11:00 Jun 26 11:00–15:00 Jun 27 07:00–08:00, 11:00–12:00 Jun 28 14:00–16:00 Jun 29 08:00–09:00, 12:00–15:00 Jun 30 07:00–10:00, 14:00–15:00
July
Jul 1 09:00–14:00 Jul 2 07:00–13:00 Jul 3 08:00–12:00, 14:00–16:00 Jul 4 07:00–12:00 Jul 5 08:00–11:00 Jul 6 08:00–13:00 Jul 7 08:00–12:00 Jul 8 11:00–18:00 Jul 9 10:00–11:00, 13:00–17:00 Jul 10 08:00–12:00 Jul 11 08:00–12:00, 14:00–15:00 Jul 12 12:00–15:00 Jul 13 08:00–12:00, 14:00–17:00 Jul 14 08:00–11:00, 13:00–15:00 Jul 16 09:00–12:00, 14:00–16:00 Jul 17 09:00–12:00, 14:00–16:00 Jul 18 08:00–12:00 Jul 20 12:00–19:00 Jul 21 12:00–17:00 Jul 22 13:00–15:00 Jul 23 12:00–18:00 Jul 24 08:00–16:00 Jul 25 11:00–15:00 Jul 27 12:00–13:00, 14:00–15:00