Most often in July, 26 days.
Highest follower count seen that year: 971.
March
Mar 19 07:00–08:00, 10:00–15:00 Mar 20 05:00–07:00, 11:00–17:00, 20:00–22:00 Mar 21 05:00–12:00, 14:00–16:00 Mar 22 00:00–01:00, 04:00–07:00, 09:00–13:00, 15:00–16:00, 19:00–23:00 Mar 23 06:00–11:00, 14:00–16:00, 18:00–24:00 Mar 24 06:00–08:00, 10:00–16:00, 18:00–19:00 Mar 25 06:00–07:00 Mar 26 05:00–06:00, 12:00–16:00, 21:00–24:00 Mar 27 05:00–07:00, 11:00–13:00, 19:00–20:00 Mar 28 05:00–08:00, 10:00–11:00, 15:00–16:00 Mar 29 04:00–06:00, 10:00–16:00, 18:00–24:00 Mar 30 00:00–01:00, 09:00–10:00, 17:00–22:00 Mar 31 16:00–17:00
April
Apr 1 09:00–14:00, 16:00–17:00, 19:00–22:00 Apr 4 07:00–08:00 Apr 5 05:00–07:00, 13:00–17:00 Apr 6 16:00–17:00 Apr 10 14:00–17:00 Apr 12 06:00–12:00, 14:00–19:00 Apr 13 04:00–08:00, 13:00–19:00 Apr 14 05:00–08:00, 16:00–18:00 Apr 15 06:00–07:00 Apr 17 12:00–13:00 Apr 18 05:00–10:00 Apr 20 09:00–10:00 Apr 23 04:00–06:00
June
Jun 5 14:00–16:00 Jun 6 00:00–03:00, 12:00–15:00, 19:00–21:00 Jun 7 02:00–04:00, 06:00–10:00, 13:00–16:00, 23:00–24:00 Jun 8 00:00–02:00, 04:00–09:00, 12:00–13:00, 15:00–18:00, 21:00–23:00 Jun 9 05:00–06:00, 09:00–12:00, 15:00–19:00 Jun 10 05:00–06:00, 18:00–21:00 Jun 11 04:00–06:00, 09:00–10:00, 14:00–18:00 Jun 12 07:00–12:00, 14:00–20:00 Jun 13 03:00–05:00, 09:00–10:00, 15:00–18:00 Jun 15 05:00–10:00, 14:00–16:00 Jun 16 02:00–03:00, 05:00–06:00, 10:00–14:00, 18:00–19:00 Jun 17 05:00–08:00, 11:00–12:00, 18:00–20:00, 23:00–24:00 Jun 18 04:00–08:00 Jun 19 04:00–05:00, 10:00–11:00, 15:00–16:00 Jun 22 14:00–17:00 Jun 23 13:00–14:00 Jun 24 04:00–16:00 Jun 25 06:00–08:00, 10:00–15:00 Jun 26 05:00–14:00, 17:00–18:00 Jun 27 16:00–19:00 Jun 28 11:00–18:00, 20:00–22:00 Jun 29 09:00–16:00, 23:00–24:00 Jun 30 00:00–01:00, 05:00–09:00, 16:00–23:00
July
Jul 1 11:00–12:00, 20:00–22:00 Jul 2 08:00–14:00, 17:00–24:00 Jul 3 00:00–01:00, 15:00–16:00, 18:00–23:00 Jul 4 08:00–24:00 Jul 5 00:00–01:00, 09:00–22:00 Jul 6 10:00–14:00, 18:00–21:00 Jul 7 00:00–02:00, 08:00–11:00, 20:00–21:00 Jul 8 10:00–22:00 Jul 9 05:00–07:00, 19:00–23:00 Jul 10 09:00–22:00 Jul 11 20:00–22:00 Jul 12 05:00–11:00, 14:00–23:00 Jul 13 07:00–12:00, 17:00–21:00 Jul 14 07:00–08:00, 16:00–20:00 Jul 15 11:00–16:00, 21:00–22:00 Jul 16 07:00–10:00, 12:00–13:00, 16:00–22:00 Jul 17 05:00–09:00, 13:00–14:00, 16:00–17:00, 19:00–23:00 Jul 18 09:00–12:00, 16:00–17:00 Jul 19 11:00–17:00 Jul 20 12:00–13:00, 22:00–23:00 Jul 21 16:00–22:00 Jul 22 13:00–14:00, 17:00–23:00 Jul 23 12:00–14:00 Jul 24 09:00–12:00, 16:00–17:00, 19:00–22:00 Jul 25 11:00–12:00, 14:00–22:00 Jul 26 00:00–01:00, 12:00–14:00, 19:00–23:00