Most often in May, 30 days.
Highest follower count seen that year: 1,135.
April
Apr 4 16:00–21:00, 23:00–24:00 Apr 5 00:00–03:00, 07:00–11:00, 18:00–20:00 Apr 6 03:00–05:00 Apr 7 15:00–17:00, 19:00–20:00 Apr 8 00:00–03:00, 06:00–09:00 Apr 9 12:00–16:00 Apr 10 00:00–03:00, 16:00–21:00 Apr 11 18:00–20:00 Apr 12 02:00–17:00 Apr 13 02:00–06:00, 13:00–17:00, 19:00–20:00 Apr 14 02:00–03:00 Apr 25 07:00–10:00, 12:00–20:00 Apr 26 03:00–09:00, 16:00–22:00 Apr 27 04:00–07:00, 10:00–17:00, 19:00–22:00 Apr 28 06:00–11:00, 15:00–21:00 Apr 29 00:00–05:00, 07:00–09:00, 11:00–12:00, 15:00–24:00 Apr 30 06:00–08:00, 16:00–24:00
May
May 1 00:00–04:00, 15:00–23:00 May 2 16:00–17:00, 23:00–24:00 May 3 01:00–02:00, 06:00–13:00, 19:00–24:00 May 4 00:00–01:00, 07:00–12:00, 14:00–15:00, 18:00–24:00 May 5 00:00–01:00, 18:00–20:00 May 6 08:00–12:00, 16:00–22:00 May 7 02:00–05:00, 10:00–11:00, 14:00–21:00 May 8 08:00–14:00, 19:00–21:00 May 9 03:00–07:00, 10:00–12:00, 14:00–21:00 May 10 06:00–19:00, 22:00–24:00 May 11 00:00–04:00, 09:00–20:00 May 12 01:00–17:00, 19:00–20:00 May 13 01:00–06:00, 09:00–11:00, 14:00–19:00 May 14 03:00–17:00, 19:00–20:00 May 15 06:00–14:00, 17:00–21:00 May 16 00:00–02:00, 06:00–20:00 May 17 01:00–06:00, 12:00–16:00, 18:00–24:00 May 18 00:00–02:00, 04:00–06:00, 08:00–12:00, 14:00–24:00 May 19 00:00–01:00, 06:00–07:00, 11:00–24:00 May 20 00:00–01:00, 06:00–13:00, 15:00–22:00 May 21 06:00–10:00, 16:00–24:00 May 22 00:00–01:00, 07:00–12:00, 15:00–21:00 May 23 00:00–01:00, 15:00–16:00, 18:00–19:00, 21:00–24:00 May 24 05:00–21:00 May 26 08:00–12:00, 15:00–16:00, 18:00–22:00 May 27 04:00–14:00, 16:00–23:00 May 28 01:00–03:00, 07:00–09:00, 12:00–16:00, 19:00–21:00 May 29 05:00–14:00, 16:00–22:00 May 30 00:00–02:00, 06:00–16:00, 18:00–24:00 May 31 06:00–10:00, 12:00–19:00
June
Jun 1 06:00–23:00 Jun 2 06:00–12:00, 15:00–23:00 Jun 3 06:00–08:00, 10:00–16:00, 18:00–21:00 Jun 4 13:00–16:00, 19:00–24:00 Jun 5 00:00–01:00, 05:00–06:00, 15:00–21:00 Jun 6 04:00–06:00, 11:00–13:00, 15:00–16:00, 18:00–23:00 Jun 7 07:00–14:00, 16:00–17:00, 19:00–22:00 Jun 8 07:00–21:00 Jun 9 05:00–13:00, 15:00–21:00 Jun 10 05:00–06:00, 08:00–14:00, 18:00–23:00 Jun 11 07:00–10:00, 13:00–20:00 Jun 12 13:00–22:00 Jun 13 07:00–11:00, 14:00–18:00 Jun 15 05:00–21:00 Jun 16 01:00–04:00, 06:00–08:00, 14:00–20:00 Jun 17 05:00–06:00, 16:00–18:00, 20:00–21:00 Jun 18 18:00–22:00 Jun 19 06:00–07:00, 15:00–16:00, 18:00–21:00 Jun 20 05:00–10:00, 13:00–17:00, 21:00–22:00 Jun 21 04:00–12:00, 15:00–21:00 Jun 22 06:00–12:00, 15:00–18:00 Jun 23 06:00–08:00, 13:00–21:00 Jun 24 06:00–09:00, 14:00–21:00 Jun 25 05:00–09:00, 15:00–22:00 Jun 26 06:00–09:00, 17:00–21:00 Jun 27 05:00–08:00, 14:00–19:00 Jun 28 12:00–16:00, 19:00–21:00 Jun 29 05:00–07:00, 11:00–14:00, 16:00–17:00
July
Jul 1 07:00–14:00, 18:00–22:00 Jul 2 05:00–10:00, 14:00–21:00 Jul 3 07:00–09:00, 15:00–23:00 Jul 4 08:00–10:00, 16:00–21:00 Jul 5 16:00–21:00 Jul 6 05:00–12:00, 14:00–15:00, 18:00–22:00 Jul 7 05:00–06:00, 08:00–10:00, 16:00–17:00, 19:00–24:00 Jul 8 07:00–09:00, 19:00–24:00 Jul 9 07:00–14:00, 16:00–17:00, 19:00–20:00, 23:00–24:00 Jul 10 00:00–02:00, 06:00–12:00, 15:00–19:00 Jul 11 00:00–02:00, 08:00–12:00, 16:00–19:00, 22:00–24:00 Jul 12 00:00–01:00, 06:00–10:00, 13:00–14:00, 16:00–22:00 Jul 13 06:00–12:00, 17:00–24:00 Jul 14 00:00–01:00, 07:00–10:00, 15:00–24:00 Jul 15 11:00–14:00, 18:00–24:00 Jul 16 01:00–02:00, 06:00–08:00, 13:00–18:00, 21:00–24:00 Jul 17 00:00–01:00, 17:00–23:00 Jul 18 16:00–17:00, 19:00–20:00 Jul 19 00:00–01:00, 06:00–12:00, 14:00–19:00 Jul 20 07:00–08:00, 12:00–15:00, 19:00–24:00 Jul 21 00:00–02:00, 19:00–20:00 Jul 22 06:00–10:00, 13:00–14:00, 17:00–20:00, 23:00–24:00 Jul 23 00:00–01:00, 10:00–11:00, 14:00–15:00 Jul 24 08:00–10:00, 12:00–13:00, 18:00–22:00 Jul 25 16:00–22:00 Jul 26 08:00–09:00, 12:00–13:00, 17:00–18:00, 19:00–24:00 Jul 27 07:00–11:00