Most often in July, 27 days.
Highest follower count seen that year: 1,548.
May
May 17 10:00–12:00, 14:00–16:00, 18:00–24:00 May 18 00:00–21:00 May 19 02:00–03:00, 07:00–15:00, 20:00–23:00 May 20 03:00–04:00, 08:00–13:00, 16:00–19:00, 21:00–22:00 May 21 04:00–07:00, 09:00–12:00, 16:00–22:00 May 22 04:00–24:00 May 23 00:00–01:00, 04:00–12:00, 14:00–19:00, 21:00–23:00 May 24 03:00–24:00 May 25 00:00–02:00, 05:00–06:00 May 26 06:00–24:00 May 27 01:00–06:00, 11:00–12:00, 18:00–20:00 May 28 00:00–17:00, 19:00–20:00 May 29 00:00–02:00, 05:00–14:00 May 30 02:00–03:00, 07:00–21:00 May 31 00:00–03:00, 06:00–20:00, 22:00–24:00
June
Jun 1 00:00–02:00, 04:00–17:00, 19:00–22:00 Jun 2 03:00–05:00, 07:00–10:00, 12:00–24:00 Jun 3 00:00–01:00, 04:00–05:00, 11:00–13:00 Jun 8 09:00–10:00, 13:00–24:00 Jun 9 00:00–02:00, 05:00–11:00 Jun 10 11:00–14:00, 17:00–21:00 Jun 11 00:00–03:00, 06:00–21:00, 23:00–24:00 Jun 12 00:00–03:00, 06:00–21:00 Jun 13 03:00–18:00 Jun 15 02:00–05:00, 07:00–21:00 Jun 16 01:00–17:00, 19:00–20:00 Jun 17 04:00–06:00, 12:00–13:00, 17:00–20:00 Jun 18 04:00–07:00 Jun 19 06:00–08:00, 11:00–12:00, 15:00–24:00 Jun 20 00:00–01:00, 04:00–18:00, 22:00–24:00 Jun 21 00:00–14:00, 16:00–24:00 Jun 22 00:00–01:00, 05:00–17:00 Jun 23 06:00–08:00, 18:00–21:00 Jun 24 00:00–03:00, 05:00–06:00, 10:00–15:00, 19:00–21:00 Jun 25 00:00–01:00, 05:00–08:00, 10:00–12:00, 16:00–22:00 Jun 26 03:00–05:00, 07:00–11:00 Jun 27 04:00–07:00, 11:00–19:00 Jun 28 11:00–16:00, 19:00–24:00 Jun 29 04:00–22:00 Jun 30 00:00–03:00, 06:00–11:00, 20:00–24:00
July
Jul 1 04:00–05:00, 11:00–12:00, 14:00–15:00, 18:00–21:00, 23:00–24:00 Jul 2 00:00–02:00, 07:00–20:00, 22:00–24:00 Jul 3 00:00–03:00, 08:00–24:00 Jul 4 00:00–01:00 Jul 5 20:00–24:00 Jul 6 00:00–11:00, 13:00–15:00, 18:00–19:00, 23:00–24:00 Jul 7 00:00–03:00, 05:00–07:00 Jul 8 08:00–24:00 Jul 9 00:00–08:00, 10:00–14:00, 16:00–17:00, 19:00–24:00 Jul 10 04:00–05:00, 09:00–17:00, 19:00–24:00 Jul 11 00:00–01:00, 03:00–22:00 Jul 12 00:00–04:00, 06:00–13:00, 15:00–20:00 Jul 13 05:00–15:00, 18:00–24:00 Jul 14 00:00–02:00, 16:00–20:00 Jul 15 16:00–24:00 Jul 16 03:00–08:00, 11:00–15:00, 19:00–24:00 Jul 17 03:00–05:00, 07:00–24:00 Jul 18 00:00–01:00, 06:00–09:00, 11:00–16:00, 18:00–24:00 Jul 19 00:00–01:00, 05:00–14:00, 16:00–22:00 Jul 20 01:00–02:00, 11:00–15:00, 17:00–20:00, 22:00–24:00 Jul 21 01:00–02:00, 11:00–14:00, 16:00–24:00 Jul 22 02:00–05:00, 12:00–13:00, 15:00–24:00 Jul 23 00:00–02:00, 08:00–09:00, 12:00–23:00 Jul 24 00:00–03:00, 05:00–07:00, 09:00–22:00 Jul 25 01:00–02:00, 11:00–14:00, 16:00–24:00 Jul 26 00:00–02:00, 11:00–14:00, 15:00–16:00, 17:00–23:00 Jul 27 00:00–02:00, 06:00–07:00, 10:00–11:00, 14:00–15:00, 17:00–18:00, 20:00–21:00