Most often in July, 28 days.
Highest follower count seen that year: 3,100.
May
May 26 12:00–17:00 May 27 13:00–15:00 May 29 01:00–02:00
June
Jun 3 15:00–21:00 Jun 4 15:00–23:00 Jun 5 06:00–11:00, 18:00–22:00 Jun 6 06:00–10:00, 12:00–21:00 Jun 7 22:00–24:00 Jun 8 00:00–01:00, 10:00–12:00, 18:00–19:00 Jun 9 05:00–07:00, 10:00–12:00, 17:00–21:00 Jun 10 17:00–23:00 Jun 11 14:00–15:00, 18:00–21:00 Jun 13 12:00–14:00, 17:00–18:00, 21:00–23:00 Jun 14 01:00–02:00 Jun 15 14:00–18:00, 23:00–24:00 Jun 16 20:00–22:00 Jun 17 15:00–21:00 Jun 18 13:00–15:00, 17:00–18:00 Jun 19 01:00–08:00, 16:00–17:00 Jun 20 15:00–17:00, 23:00–24:00 Jun 21 00:00–05:00 Jun 22 12:00–17:00 Jun 23 04:00–11:00, 15:00–17:00 Jun 24 06:00–13:00 Jun 25 07:00–09:00, 11:00–17:00 Jun 26 18:00–20:00 Jun 27 06:00–10:00 Jun 28 13:00–15:00, 17:00–21:00 Jun 29 19:00–24:00 Jun 30 19:00–20:00
July
Jul 1 15:00–19:00, 21:00–23:00 Jul 2 12:00–14:00, 16:00–22:00 Jul 3 16:00–22:00 Jul 4 02:00–03:00, 17:00–24:00 Jul 5 00:00–03:00, 20:00–21:00 Jul 7 02:00–07:00, 16:00–18:00 Jul 9 08:00–12:00, 23:00–24:00 Jul 10 00:00–02:00, 20:00–21:00, 23:00–24:00 Jul 11 00:00–05:00 Jul 12 00:00–12:00, 15:00–18:00 Jul 13 17:00–19:00 Jul 14 12:00–15:00 Jul 15 06:00–10:00, 14:00–16:00 Jul 16 11:00–13:00, 16:00–20:00 Jul 17 08:00–11:00, 13:00–16:00 Jul 18 11:00–18:00 Jul 19 16:00–18:00 Jul 20 17:00–23:00 Jul 21 07:00–08:00, 11:00–13:00, 17:00–20:00, 23:00–24:00 Jul 22 00:00–03:00, 11:00–16:00, 21:00–24:00 Jul 23 08:00–11:00, 13:00–17:00, 19:00–21:00 Jul 24 21:00–24:00 Jul 25 00:00–01:00, 19:00–22:00 Jul 26 18:00–24:00 Jul 27 02:00–03:00 Jul 28 00:00–06:00, 14:00–16:00 Jul 29 01:00–03:00, 19:00–22:00 Jul 31 00:00–02:00, 05:00–07:00, 13:00–14:00
August
Aug 1 03:00–07:00 Aug 2 02:00–06:00, 14:00–16:00 Aug 4 05:00–10:00 Aug 6 14:00–15:00 Aug 7 06:00–10:00 Aug 8 07:00–13:00, 15:00–17:00 Aug 9 07:00–10:00, 12:00–16:00 Aug 10 08:00–13:00 Aug 11 17:00–24:00 Aug 12 00:00–01:00, 19:00–24:00 Aug 13 00:00–02:00, 17:00–23:00 Aug 14 13:00–15:00, 19:00–22:00 Aug 15 17:00–19:00, 22:00–24:00 Aug 16 00:00–03:00, 17:00–24:00 Aug 17 00:00–02:00, 22:00–24:00 Aug 18 00:00–03:00, 21:00–24:00 Aug 19 00:00–04:00, 22:00–24:00 Aug 20 00:00–06:00, 23:00–24:00 Aug 21 00:00–08:00 Aug 23 03:00–09:00 Aug 25 14:00–19:00 Aug 26 12:00–14:00, 16:00–19:00 Aug 27 01:00–03:00, 10:00–14:00, 17:00–19:00 Aug 28 14:00–16:00, 18:00–23:00 Aug 29 08:00–10:00, 20:00–21:00 Aug 30 19:00–21:00 Aug 31 23:00–24:00
September
Sep 1 00:00–01:00 Sep 3 00:00–01:00 Sep 5 00:00–03:00, 05:00–07:00 Sep 6 01:00–08:00 Sep 7 03:00–06:00, 08:00–12:00 Sep 8 01:00–10:00, 17:00–18:00, 22:00–23:00 Sep 11 16:00–17:00 Sep 12 15:00–17:00, 19:00–21:00 Sep 13 15:00–20:00 Sep 14 13:00–18:00, 20:00–21:00 Sep 15 20:00–23:00 Sep 17 16:00–22:00 Sep 18 16:00–17:00 Sep 21 14:00–17:00, 19:00–22:00 Sep 22 10:00–14:00 Sep 23 14:00–17:00 Sep 25 23:00–24:00 Sep 26 00:00–01:00, 17:00–21:00 Sep 27 12:00–16:00 Sep 29 00:00–03:00
October
Oct 1 00:00–05:00, 13:00–18:00 Oct 3 02:00–03:00 Oct 6 16:00–19:00 Oct 8 05:00–07:00 Oct 9 05:00–09:00, 13:00–16:00 Oct 12 14:00–19:00 Oct 14 14:00–20:00 Oct 15 17:00–19:00 Oct 16 12:00–16:00, 21:00–23:00 Oct 20 10:00–14:00, 16:00–17:00, 19:00–22:00 Oct 21 20:00–22:00 Oct 22 18:00–24:00 Oct 23 19:00–20:00, 22:00–23:00 Oct 24 22:00–24:00 Oct 25 00:00–02:00 Oct 26 18:00–20:00, 22:00–24:00 Oct 27 00:00–01:00 Oct 28 00:00–03:00
November
Nov 1 00:00–02:00, 17:00–18:00 Nov 2 04:00–08:00 Nov 5 15:00–17:00 Nov 7 15:00–20:00 Nov 8 17:00–20:00, 22:00–23:00 Nov 9 16:00–18:00, 20:00–22:00 Nov 11 23:00–24:00 Nov 12 00:00–04:00, 15:00–18:00 Nov 13 05:00–08:00, 15:00–18:00 Nov 14 15:00–20:00 Nov 15 13:00–20:00 Nov 16 13:00–18:00 Nov 18 15:00–20:00 Nov 22 18:00–21:00, 23:00–24:00 Nov 23 00:00–01:00, 16:00–24:00 Nov 24 00:00–01:00 Nov 26 21:00–23:00 Nov 29 09:00–10:00 Nov 30 14:00–15:00, 23:00–24:00
December
Dec 1 00:00–01:00, 04:00–06:00, 09:00–10:00, 14:00–16:00 Dec 2 00:00–04:00, 06:00–08:00, 11:00–14:00 Dec 3 06:00–09:00 Dec 5 05:00–09:00, 11:00–12:00 Dec 6 14:00–16:00 Dec 7 08:00–11:00 Dec 8 14:00–16:00 Dec 10 03:00–05:00, 15:00–17:00 Dec 11 15:00–20:00 Dec 12 15:00–18:00 Dec 14 20:00–22:00 Dec 15 16:00–19:00 Dec 16 14:00–20:00 Dec 17 15:00–21:00 Dec 18 17:00–21:00 Dec 19 17:00–18:00 Dec 21 19:00–23:00 Dec 22 15:00–18:00, 20:00–23:00 Dec 23 20:00–24:00 Dec 24 00:00–01:00 Dec 25 20:00–23:00 Dec 27 02:00–06:00, 08:00–11:00 Dec 28 01:00–06:00, 08:00–10:00 Dec 29 00:00–03:00, 09:00–11:00 Dec 30 05:00–09:00