Most often in November, 30 days.
Highest follower count seen that year: 1,156.
October
Oct 8 19:00–24:00 Oct 9 01:00–03:00, 09:00–17:00, 20:00–24:00 Oct 10 04:00–06:00, 09:00–16:00, 20:00–22:00 Oct 11 01:00–05:00, 08:00–11:00, 13:00–17:00, 19:00–24:00 Oct 12 01:00–06:00, 10:00–12:00, 15:00–22:00 Oct 13 00:00–02:00, 07:00–14:00, 16:00–18:00, 20:00–23:00 Oct 14 02:00–03:00, 08:00–11:00, 15:00–22:00 Oct 15 01:00–02:00, 05:00–07:00, 09:00–11:00, 14:00–24:00 Oct 16 00:00–01:00, 07:00–14:00, 18:00–24:00 Oct 17 00:00–03:00, 06:00–23:00 Oct 18 04:00–07:00, 09:00–11:00, 14:00–21:00 Oct 19 01:00–02:00, 04:00–11:00, 13:00–17:00, 20:00–23:00 Oct 20 03:00–05:00, 08:00–10:00, 15:00–18:00, 21:00–22:00 Oct 21 03:00–08:00, 11:00–13:00, 15:00–18:00, 20:00–24:00 Oct 22 00:00–04:00, 06:00–13:00, 15:00–20:00 Oct 23 02:00–08:00, 11:00–18:00, 23:00–24:00 Oct 24 00:00–01:00, 04:00–05:00, 07:00–08:00, 11:00–15:00, 17:00–21:00 Oct 25 00:00–07:00, 11:00–13:00, 20:00–21:00, 23:00–24:00 Oct 26 00:00–02:00, 04:00–05:00, 15:00–17:00, 19:00–22:00 Oct 27 02:00–06:00, 12:00–21:00 Oct 28 02:00–04:00, 10:00–13:00, 16:00–18:00 Oct 29 02:00–09:00, 15:00–17:00, 19:00–23:00 Oct 30 01:00–03:00, 05:00–11:00, 19:00–23:00 Oct 31 01:00–06:00, 09:00–11:00, 16:00–17:00, 19:00–20:00, 23:00–24:00
November
Nov 1 00:00–01:00, 05:00–10:00, 19:00–20:00 Nov 2 00:00–02:00, 04:00–06:00, 10:00–13:00, 16:00–24:00 Nov 3 00:00–02:00, 05:00–06:00, 09:00–13:00, 15:00–17:00, 19:00–21:00 Nov 4 01:00–06:00, 10:00–12:00, 21:00–22:00 Nov 5 00:00–03:00 Nov 6 02:00–07:00, 10:00–14:00, 18:00–21:00 Nov 7 02:00–06:00, 10:00–11:00, 19:00–22:00 Nov 8 01:00–02:00, 04:00–11:00, 14:00–18:00 Nov 9 02:00–06:00, 08:00–18:00 Nov 10 01:00–07:00, 10:00–12:00, 14:00–18:00, 20:00–22:00 Nov 11 03:00–05:00, 07:00–12:00, 14:00–16:00, 18:00–19:00 Nov 12 00:00–06:00, 09:00–11:00, 15:00–22:00 Nov 13 02:00–07:00, 10:00–13:00, 15:00–21:00 Nov 14 00:00–03:00, 05:00–06:00, 12:00–13:00, 16:00–18:00, 20:00–21:00 Nov 15 00:00–05:00, 09:00–10:00, 17:00–18:00, 20:00–23:00 Nov 16 02:00–06:00, 08:00–18:00, 22:00–24:00 Nov 17 00:00–02:00, 05:00–11:00, 16:00–20:00 Nov 18 03:00–05:00, 09:00–12:00, 14:00–24:00 Nov 19 00:00–01:00, 10:00–13:00, 16:00–22:00 Nov 20 02:00–11:00, 15:00–16:00, 20:00–23:00 Nov 21 02:00–07:00, 09:00–12:00, 15:00–20:00 Nov 22 00:00–04:00, 07:00–11:00, 15:00–18:00 Nov 23 07:00–18:00, 23:00–24:00 Nov 24 00:00–01:00, 05:00–06:00, 10:00–11:00, 16:00–17:00, 21:00–23:00 Nov 25 00:00–02:00, 04:00–06:00, 09:00–11:00, 15:00–18:00, 21:00–23:00 Nov 26 03:00–06:00, 09:00–11:00, 16:00–18:00, 21:00–24:00 Nov 27 02:00–04:00, 09:00–12:00, 20:00–24:00 Nov 28 00:00–01:00, 06:00–07:00, 09:00–11:00, 15:00–24:00 Nov 29 06:00–07:00, 10:00–17:00, 19:00–24:00 Nov 30 08:00–12:00, 14:00–24:00
December
Dec 1 00:00–01:00, 07:00–13:00, 15:00–18:00, 20:00–23:00 Dec 2 05:00–12:00, 15:00–24:00 Dec 3 00:00–02:00 Dec 4 02:00–06:00, 10:00–12:00, 14:00–15:00, 20:00–24:00 Dec 5 00:00–01:00, 10:00–12:00, 15:00–22:00 Dec 6 02:00–07:00, 10:00–13:00, 15:00–22:00 Dec 7 00:00–03:00, 09:00–13:00, 15:00–24:00 Dec 8 02:00–03:00, 09:00–12:00, 15:00–17:00, 19:00–22:00 Dec 9 01:00–03:00, 09:00–12:00, 15:00–21:00, 23:00–24:00 Dec 10 00:00–04:00, 06:00–08:00, 10:00–13:00, 15:00–24:00 Dec 11 00:00–01:00, 05:00–09:00, 11:00–12:00, 16:00–17:00, 20:00–24:00 Dec 12 03:00–05:00, 08:00–12:00, 14:00–17:00, 19:00–24:00 Dec 13 00:00–04:00, 06:00–08:00, 13:00–14:00, 16:00–18:00, 20:00–24:00 Dec 14 00:00–01:00, 05:00–08:00, 12:00–17:00, 20:00–24:00 Dec 15 00:00–04:00, 07:00–09:00, 12:00–18:00, 20:00–23:00 Dec 16 00:00–01:00, 06:00–07:00, 10:00–12:00, 16:00–17:00, 19:00–20:00, 22:00–24:00 Dec 17 02:00–04:00, 10:00–13:00, 15:00–21:00, 23:00–24:00 Dec 18 00:00–05:00, 09:00–12:00, 14:00–15:00, 19:00–21:00, 23:00–24:00 Dec 19 00:00–04:00, 12:00–13:00, 15:00–23:00 Dec 20 00:00–07:00, 16:00–17:00, 19:00–21:00, 23:00–24:00 Dec 21 00:00–06:00, 11:00–12:00, 16:00–17:00, 19:00–21:00 Dec 22 00:00–06:00, 09:00–11:00, 16:00–17:00, 20:00–21:00, 23:00–24:00 Dec 23 00:00–02:00, 04:00–08:00, 10:00–12:00, 18:00–21:00 Dec 24 00:00–05:00, 10:00–12:00, 15:00–18:00, 23:00–24:00 Dec 25 00:00–02:00, 05:00–06:00, 16:00–24:00 Dec 26 00:00–02:00, 08:00–11:00, 16:00–17:00, 21:00–24:00 Dec 27 02:00–03:00