Most often in October, 29 days.
Highest follower count seen that year: 4,065.
May
May 24 13:00–20:00 May 25 12:00–18:00 May 26 19:00–24:00 May 27 00:00–01:00, 16:00–23:00 May 28 16:00–24:00 May 29 15:00–21:00 May 30 21:00–23:00 May 31 15:00–19:00
June
Jun 1 11:00–18:00 Jun 3 16:00–22:00 Jun 4 19:00–24:00 Jun 5 00:00–01:00, 17:00–21:00 Jun 7 18:00–21:00 Jun 8 12:00–18:00 Jun 9 19:00–24:00 Jun 10 00:00–02:00 Jun 11 19:00–24:00 Jun 12 00:00–03:00, 21:00–23:00 Jun 14 11:00–17:00 Jun 15 09:00–15:00 Jun 16 18:00–24:00 Jun 17 00:00–01:00, 18:00–24:00 Jun 18 00:00–01:00, 16:00–24:00 Jun 19 00:00–02:00, 19:00–24:00 Jun 20 00:00–02:00, 19:00–24:00 Jun 21 00:00–02:00, 21:00–24:00 Jun 22 00:00–01:00, 12:00–16:00 Jun 23 16:00–22:00 Jun 24 19:00–24:00 Jun 25 00:00–02:00, 16:00–22:00 Jun 26 13:00–19:00 Jun 27 15:00–18:00 Jun 28 13:00–18:00 Jun 29 11:00–19:00 Jun 30 14:00–19:00
July
Jul 1 17:00–24:00 Jul 2 00:00–01:00, 20:00–24:00 Jul 3 17:00–22:00 Jul 4 18:00–24:00 Jul 5 00:00–01:00, 12:00–17:00 Jul 6 10:00–17:00 Jul 7 18:00–22:00 Jul 8 15:00–22:00 Jul 9 14:00–20:00 Jul 10 17:00–22:00 Jul 13 12:00–18:00 Jul 14 18:00–24:00 Jul 15 00:00–01:00, 18:00–24:00 Jul 16 00:00–01:00, 16:00–23:00 Jul 17 17:00–24:00 Jul 18 17:00–24:00 Jul 20 12:00–17:00 Jul 21 18:00–24:00 Jul 22 17:00–24:00 Jul 23 00:00–02:00, 17:00–24:00 Jul 24 16:00–23:00 Jul 25 22:00–24:00 Jul 26 00:00–01:00 Jul 27 12:00–16:00, 19:00–21:00 Jul 28 15:00–23:00
August
Aug 2 14:00–18:00 Aug 3 11:00–18:00 Aug 4 18:00–24:00 Aug 5 18:00–24:00 Aug 6 00:00–01:00, 18:00–24:00 Aug 7 00:00–01:00, 17:00–24:00 Aug 8 18:00–23:00 Aug 9 13:00–17:00 Aug 10 11:00–17:00 Aug 11 20:00–23:00 Aug 12 18:00–23:00 Aug 13 19:00–24:00 Aug 14 00:00–01:00, 16:00–20:00 Aug 15 14:00–21:00 Aug 17 12:00–18:00 Aug 18 16:00–20:00 Aug 19 18:00–24:00 Aug 20 00:00–01:00, 16:00–24:00 Aug 21 00:00–01:00, 14:00–20:00 Aug 22 16:00–22:00 Aug 24 12:00–18:00 Aug 25 21:00–24:00 Aug 26 00:00–01:00, 18:00–22:00 Aug 28 17:00–22:00 Aug 29 14:00–22:00 Aug 31 11:00–13:00, 17:00–22:00
September
Sep 1 12:00–16:00 Sep 2 19:00–24:00 Sep 3 00:00–03:00, 16:00–23:00 Sep 4 17:00–22:00 Sep 5 14:00–21:00 Sep 7 13:00–18:00 Sep 8 14:00–20:00 Sep 9 16:00–19:00 Sep 10 20:00–24:00 Sep 11 00:00–01:00, 18:00–23:00 Sep 12 16:00–23:00 Sep 14 12:00–17:00 Sep 15 19:00–24:00 Sep 16 16:00–24:00 Sep 17 00:00–05:00, 16:00–23:00 Sep 18 15:00–23:00 Sep 19 12:00–19:00 Sep 21 15:00–21:00 Sep 22 17:00–23:00 Sep 23 16:00–24:00 Sep 24 19:00–23:00 Sep 25 11:00–17:00 Sep 27 11:00–17:00 Sep 28 12:00–17:00 Sep 29 11:00–19:00 Sep 30 12:00–21:00
October
Oct 1 13:00–19:00 Oct 2 17:00–24:00 Oct 3 00:00–02:00, 16:00–23:00 Oct 5 11:00–14:00 Oct 6 15:00–21:00 Oct 7 17:00–22:00 Oct 8 17:00–23:00 Oct 9 23:00–24:00 Oct 10 00:00–01:00, 15:00–19:00 Oct 11 15:00–21:00 Oct 12 12:00–18:00 Oct 13 19:00–22:00 Oct 14 18:00–24:00 Oct 15 16:00–23:00 Oct 16 19:00–24:00 Oct 17 00:00–01:00 Oct 18 11:00–17:00 Oct 19 12:00–14:00 Oct 20 22:00–24:00 Oct 21 00:00–02:00 Oct 22 00:00–02:00, 16:00–21:00, 23:00–24:00 Oct 23 18:00–24:00 Oct 25 13:00–19:00 Oct 26 14:00–17:00 Oct 27 20:00–24:00 Oct 28 19:00–23:00 Oct 29 15:00–21:00 Oct 30 18:00–24:00 Oct 31 16:00–19:00
November
Nov 2 12:00–17:00 Nov 3 21:00–23:00 Nov 4 19:00–23:00 Nov 5 17:00–24:00 Nov 6 00:00–01:00, 15:00–20:00 Nov 7 14:00–18:00 Nov 8 13:00–19:00 Nov 9 12:00–17:00 Nov 10 14:00–19:00 Nov 11 14:00–20:00 Nov 12 16:00–21:00 Nov 13 20:00–23:00 Nov 14 12:00–20:00 Nov 15 13:00–16:00 Nov 16 20:00–24:00 Nov 17 13:00–17:00 Nov 18 12:00–17:00 Nov 19 11:00–16:00 Nov 20 13:00–19:00 Nov 21 13:00–19:00 Nov 24 13:00–20:00 Nov 25 13:00–20:00 Nov 26 13:00–19:00 Nov 28 12:00–17:00 Nov 30 13:00–15:00
December
Dec 1 13:00–20:00 Dec 2 15:00–20:00 Dec 3 13:00–20:00 Dec 4 13:00–20:00 Dec 5 14:00–20:00 Dec 7 13:00–16:00 Dec 8 13:00–18:00 Dec 9 14:00–20:00 Dec 10 13:00–20:00 Dec 11 12:00–18:00 Dec 12 13:00–19:00 Dec 14 12:00–18:00 Dec 15 18:00–24:00 Dec 16 17:00–22:00 Dec 17 16:00–21:00 Dec 18 16:00–22:00 Dec 20 13:00–15:00 Dec 21 13:00–17:00 Dec 22 15:00–19:00 Dec 23 16:00–21:00 Dec 26 13:00–17:00 Dec 28 12:00–15:00 Dec 29 14:00–17:00 Dec 30 14:00–17:00 Dec 31 13:00–16:00