Most often in May, 30 days.
Highest follower count seen that year: 1,657.
May
May 2 03:00–06:00, 08:00–10:00 May 3 04:00–16:00 May 4 05:00–15:00 May 5 04:00–08:00, 11:00–17:00 May 6 04:00–10:00, 12:00–15:00 May 7 07:00–11:00, 15:00–17:00 May 8 05:00–14:00 May 9 05:00–11:00, 14:00–17:00 May 10 05:00–16:00 May 11 04:00–12:00, 14:00–17:00 May 12 04:00–16:00 May 13 05:00–15:00 May 14 05:00–16:00 May 15 05:00–14:00, 16:00–17:00 May 16 07:00–16:00 May 17 04:00–15:00 May 18 06:00–11:00, 14:00–19:00 May 19 05:00–09:00, 12:00–16:00 May 20 05:00–13:00, 15:00–17:00 May 21 05:00–14:00, 19:00–24:00 May 22 04:00–07:00, 09:00–23:00 May 23 04:00–17:00, 22:00–24:00 May 24 00:00–01:00, 04:00–16:00, 20:00–22:00 May 25 06:00–20:00 May 26 04:00–07:00, 15:00–18:00 May 27 04:00–16:00, 18:00–22:00 May 28 09:00–18:00 May 29 06:00–18:00 May 30 05:00–17:00, 22:00–24:00 May 31 07:00–09:00, 12:00–16:00
June
Jun 1 04:00–16:00 Jun 3 08:00–12:00 Jun 4 07:00–14:00 Jun 5 07:00–17:00 Jun 6 05:00–08:00, 10:00–16:00 Jun 7 09:00–18:00 Jun 8 06:00–10:00, 12:00–23:00 Jun 9 04:00–16:00 Jun 10 09:00–10:00, 19:00–22:00 Jun 11 01:00–04:00, 10:00–11:00, 20:00–24:00 Jun 12 02:00–04:00, 18:00–23:00 Jun 13 00:00–06:00, 08:00–09:00 Jun 15 03:00–05:00, 17:00–21:00 Jun 16 02:00–05:00, 16:00–17:00, 20:00–24:00 Jun 17 04:00–05:00, 18:00–23:00 Jun 18 05:00–11:00, 20:00–23:00 Jun 19 02:00–04:00, 18:00–19:00, 21:00–22:00 Jun 20 08:00–12:00, 15:00–24:00 Jun 21 00:00–05:00, 18:00–20:00 Jun 22 00:00–04:00, 06:00–11:00, 13:00–21:00, 23:00–24:00 Jun 23 00:00–01:00, 12:00–14:00, 18:00–24:00 Jun 24 00:00–04:00, 06:00–08:00, 18:00–22:00 Jun 25 19:00–22:00 Jun 26 01:00–04:00, 18:00–23:00 Jun 27 02:00–04:00, 17:00–23:00 Jun 28 03:00–05:00, 18:00–22:00 Jun 29 01:00–04:00, 18:00–22:00 Jun 30 01:00–04:00, 18:00–23:00
July
Jul 1 01:00–05:00, 19:00–21:00 Jul 2 04:00–15:00, 22:00–24:00 Jul 3 00:00–01:00, 07:00–15:00 Jul 4 08:00–10:00, 18:00–20:00 Jul 5 02:00–07:00, 14:00–23:00 Jul 6 02:00–04:00, 06:00–14:00, 18:00–23:00 Jul 7 03:00–05:00, 10:00–12:00, 16:00–17:00, 21:00–24:00 Jul 8 00:00–05:00, 07:00–14:00, 18:00–21:00 Jul 9 01:00–07:00, 19:00–23:00 Jul 10 03:00–05:00, 11:00–22:00 Jul 11 02:00–13:00, 16:00–24:00 Jul 12 01:00–09:00, 18:00–23:00 Jul 13 04:00–05:00, 07:00–08:00, 14:00–15:00, 17:00–24:00 Jul 14 03:00–07:00, 11:00–12:00, 17:00–24:00 Jul 15 17:00–21:00 Jul 16 03:00–05:00, 07:00–10:00, 14:00–16:00, 19:00–22:00 Jul 17 04:00–08:00, 18:00–23:00 Jul 18 04:00–08:00 Jul 19 06:00–10:00, 12:00–13:00, 15:00–22:00 Jul 20 04:00–09:00, 22:00–23:00 Jul 21 01:00–02:00, 04:00–05:00, 11:00–14:00, 17:00–22:00 Jul 22 04:00–07:00, 11:00–13:00, 20:00–24:00 Jul 23 01:00–07:00, 09:00–10:00, 22:00–23:00 Jul 24 00:00–03:00, 06:00–11:00, 13:00–21:00 Jul 25 04:00–07:00, 17:00–23:00 Jul 26 03:00–05:00, 09:00–10:00, 11:00–16:00, 17:00–24:00 Jul 27 06:00–12:00, 14:00–15:00 Jul 30 17:00–20:00