Most often in June, 29 days.
Highest follower count seen that year: 6,354.
January
Jan 1 00:00–02:00, 12:00–13:00, 16:00–24:00 Jan 2 19:00–24:00 Jan 3 00:00–01:00, 12:00–18:00 Jan 4 19:00–24:00 Jan 5 00:00–01:00 Jan 6 09:00–24:00 Jan 7 00:00–02:00 Jan 11 10:00–15:00, 17:00–20:00 Jan 13 23:00–24:00 Jan 14 00:00–01:00 Jan 15 09:00–14:00, 22:00–24:00 Jan 16 00:00–01:00, 08:00–12:00, 15:00–24:00 Jan 17 00:00–02:00, 21:00–24:00 Jan 18 00:00–01:00, 09:00–23:00 Jan 19 00:00–02:00, 09:00–21:00 Jan 20 12:00–24:00 Jan 21 00:00–01:00, 10:00–24:00 Jan 22 00:00–01:00, 12:00–15:00, 19:00–22:00 Jan 23 19:00–24:00 Jan 24 00:00–01:00, 17:00–24:00 Jan 25 14:00–20:00, 22:00–23:00 Jan 26 12:00–16:00, 22:00–24:00 Jan 27 00:00–01:00, 10:00–24:00 Jan 28 00:00–02:00, 11:00–24:00 Jan 29 00:00–03:00 Jan 30 08:00–10:00, 12:00–18:00 Jan 31 09:00–13:00, 16:00–22:00
February
Feb 1 10:00–14:00, 20:00–24:00 Feb 2 00:00–01:00, 15:00–24:00 Feb 3 00:00–02:00, 10:00–24:00 Feb 4 11:00–24:00 Feb 5 00:00–01:00, 14:00–21:00 Feb 6 11:00–22:00 Feb 8 09:00–20:00 Feb 9 09:00–21:00 Feb 10 10:00–13:00, 19:00–23:00 Feb 12 09:00–12:00, 19:00–22:00 Feb 14 09:00–14:00, 21:00–24:00 Feb 15 17:00–24:00 Feb 16 09:00–14:00 Feb 17 19:00–24:00 Feb 18 12:00–13:00, 19:00–24:00 Feb 19 10:00–12:00, 19:00–22:00 Feb 20 20:00–24:00 Feb 21 00:00–01:00, 15:00–23:00 Feb 22 18:00–24:00 Feb 23 20:00–23:00 Feb 24 20:00–23:00 Feb 25 10:00–15:00, 21:00–24:00 Feb 26 00:00–01:00, 09:00–14:00, 20:00–23:00 Feb 27 10:00–13:00, 19:00–24:00 Feb 28 00:00–01:00, 12:00–24:00
March
Mar 1 00:00–01:00, 15:00–19:00 Mar 2 18:00–23:00 Mar 3 12:00–17:00, 19:00–24:00 Mar 4 00:00–01:00, 19:00–22:00 Mar 6 09:00–11:00 Mar 7 09:00–15:00 Mar 10 11:00–21:00 Mar 11 09:00–16:00 Mar 12 08:00–13:00 Mar 13 08:00–17:00 Mar 14 08:00–11:00 Mar 15 08:00–13:00 Mar 17 13:00–14:00 Mar 18 09:00–10:00, 21:00–24:00 Mar 20 10:00–12:00 Mar 21 13:00–15:00 Mar 22 08:00–24:00 Mar 23 11:00–19:00 Mar 24 09:00–17:00, 19:00–22:00 Mar 25 16:00–20:00 Mar 26 10:00–15:00, 21:00–23:00 Mar 27 10:00–13:00, 20:00–22:00 Mar 28 10:00–13:00, 19:00–24:00 Mar 29 08:00–17:00, 19:00–22:00 Mar 30 14:00–21:00 Mar 31 09:00–21:00
April
Apr 1 18:00–22:00 Apr 2 09:00–12:00, 16:00–20:00 Apr 3 10:00–12:00, 16:00–17:00 Apr 5 19:00–21:00 Apr 6 18:00–21:00 Apr 7 09:00–11:00, 20:00–21:00 Apr 8 16:00–18:00 Apr 9 10:00–11:00 Apr 10 14:00–22:00 Apr 11 14:00–24:00 Apr 12 08:00–13:00, 18:00–21:00 Apr 13 18:00–20:00 Apr 14 09:00–11:00, 19:00–24:00 Apr 15 12:00–14:00, 18:00–22:00 Apr 16 06:00–10:00, 14:00–18:00 Apr 17 08:00–17:00 Apr 18 12:00–15:00 Apr 19 10:00–13:00, 19:00–20:00 Apr 20 09:00–10:00 Apr 21 08:00–09:00, 19:00–20:00 Apr 22 10:00–15:00, 20:00–21:00 Apr 23 09:00–11:00 Apr 24 07:00–10:00, 20:00–21:00 Apr 25 08:00–10:00, 15:00–18:00 Apr 26 07:00–10:00 Apr 28 13:00–14:00 Apr 29 09:00–10:00, 19:00–21:00 Apr 30 10:00–13:00, 19:00–21:00
May
May 1 07:00–10:00 May 3 10:00–11:00 May 4 07:00–10:00 May 5 08:00–11:00 May 6 08:00–10:00 May 7 19:00–20:00 May 8 07:00–08:00 May 9 09:00–10:00, 16:00–17:00 May 10 07:00–10:00 May 12 08:00–10:00, 19:00–21:00 May 13 18:00–23:00 May 16 06:00–09:00, 15:00–20:00 May 17 12:00–14:00 May 18 18:00–21:00 May 19 09:00–11:00 May 21 09:00–10:00 May 22 05:00–11:00, 18:00–21:00 May 23 09:00–15:00 May 24 08:00–10:00, 13:00–16:00 May 25 08:00–21:00 May 26 06:00–21:00 May 27 08:00–23:00 May 28 06:00–24:00 May 29 00:00–01:00, 07:00–19:00 May 30 06:00–20:00 May 31 12:00–16:00
June
Jun 1 09:00–17:00 Jun 2 07:00–10:00, 15:00–18:00, 21:00–23:00 Jun 3 08:00–10:00, 15:00–19:00 Jun 4 16:00–24:00 Jun 5 00:00–01:00, 06:00–11:00, 17:00–20:00 Jun 6 07:00–11:00, 13:00–19:00 Jun 7 06:00–14:00 Jun 8 05:00–10:00, 16:00–18:00 Jun 9 06:00–10:00, 14:00–17:00, 19:00–21:00 Jun 10 08:00–15:00, 17:00–18:00 Jun 11 09:00–10:00, 13:00–19:00 Jun 12 07:00–12:00, 16:00–20:00 Jun 13 08:00–11:00, 17:00–19:00 Jun 15 06:00–09:00, 15:00–21:00 Jun 16 07:00–10:00, 12:00–14:00, 18:00–22:00 Jun 17 06:00–20:00 Jun 18 07:00–20:00 Jun 19 10:00–12:00, 16:00–22:00 Jun 20 08:00–20:00 Jun 21 07:00–10:00, 15:00–18:00 Jun 22 08:00–20:00 Jun 23 07:00–10:00, 12:00–16:00, 21:00–22:00 Jun 24 08:00–21:00 Jun 25 08:00–21:00 Jun 26 07:00–13:00, 16:00–23:00 Jun 27 11:00–19:00 Jun 28 20:00–23:00 Jun 29 10:00–22:00 Jun 30 06:00–10:00, 19:00–21:00
July
Jul 1 07:00–13:00, 20:00–23:00 Jul 2 10:00–19:00 Jul 3 16:00–19:00 Jul 4 07:00–12:00, 16:00–19:00 Jul 5 06:00–09:00, 19:00–21:00 Jul 6 05:00–12:00, 19:00–22:00 Jul 7 07:00–08:00 Jul 8 09:00–15:00 Jul 9 07:00–10:00, 13:00–21:00 Jul 10 07:00–14:00, 19:00–23:00 Jul 11 08:00–10:00 Jul 12 18:00–22:00 Jul 13 10:00–11:00, 15:00–22:00 Jul 14 07:00–09:00, 12:00–15:00, 21:00–22:00 Jul 15 08:00–09:00, 16:00–23:00 Jul 16 07:00–11:00, 15:00–16:00, 21:00–23:00 Jul 17 06:00–17:00 Jul 18 10:00–16:00, 18:00–20:00 Jul 19 08:00–10:00, 16:00–18:00 Jul 21 12:00–18:00 Jul 22 07:00–20:00 Jul 23 08:00–14:00 Jul 24 07:00–10:00, 13:00–20:00 Jul 25 17:00–19:00 Jul 26 13:00–14:00, 15:00–16:00 Jul 27 06:00–13:00, 14:00–15:00, 17:00–18:00