Most often in July, 20 days.
Highest follower count seen that year: 16,610.
January
Jan 4 17:00–22:00 Jan 5 17:00–21:00 Jan 8 15:00–20:00 Jan 10 15:00–18:00 Jan 11 17:00–21:00 Jan 13 18:00–23:00 Jan 15 14:00–17:00 Jan 16 20:00–24:00 Jan 17 00:00–01:00, 16:00–19:00 Jan 19 16:00–20:00 Jan 20 15:00–20:00 Jan 23 20:00–22:00 Jan 24 15:00–19:00 Jan 26 16:00–19:00 Jan 28 17:00–23:00 Jan 31 16:00–21:00
February
Feb 3 15:00–19:00 Feb 4 20:00–23:00 Feb 5 15:00–20:00 Feb 7 19:00–23:00 Feb 9 18:00–22:00 Feb 10 14:00–20:00 Feb 12 22:00–24:00 Feb 13 16:00–20:00 Feb 16 17:00–21:00 Feb 18 13:00–18:00 Feb 20 15:00–21:00 Feb 21 16:00–20:00 Feb 24 14:00–21:00 Feb 25 20:00–24:00 Feb 26 17:00–20:00 Feb 28 15:00–18:00
March
Mar 1 21:00–24:00 Mar 2 00:00–01:00, 16:00–22:00 Mar 3 14:00–17:00 Mar 6 14:00–20:00 Mar 7 15:00–19:00 Mar 9 19:00–24:00 Mar 10 16:00–19:00 Mar 11 16:00–21:00 Mar 14 17:00–21:00 Mar 17 14:00–19:00 Mar 19 16:00–21:00 Mar 23 16:00–22:00 Mar 24 17:00–22:00 Mar 26 18:00–23:00 Mar 28 16:00–19:00 Mar 30 15:00–20:00
April
Apr 1 15:00–19:00 Apr 2 15:00–20:00 Apr 3 17:00–20:00 Apr 4 17:00–20:00 Apr 6 19:00–23:00 Apr 7 17:00–21:00 Apr 9 15:00–18:00 Apr 11 19:00–24:00 Apr 12 19:00–24:00 Apr 14 16:00–19:00 Apr 16 15:00–20:00 Apr 18 20:00–22:00 Apr 20 18:00–22:00 Apr 22 16:00–21:00 Apr 23 20:00–23:00 Apr 24 17:00–22:00 Apr 29 15:00–18:00
May
May 2 10:00–14:00 May 3 20:00–22:00 May 5 19:00–21:00 May 7 19:00–24:00 May 9 15:00–20:00 May 10 15:00–17:00 May 11 12:00–16:00 May 12 15:00–19:00 May 13 13:00–17:00 May 17 15:00–20:00 May 18 18:00–21:00 May 19 11:00–16:00 May 20 15:00–21:00 May 21 14:00–19:00 May 22 15:00–19:00 May 24 19:00–23:00 May 25 19:00–23:00 May 28 15:00–19:00 May 31 18:00–21:00
June
Jun 2 14:00–19:00 Jun 3 16:00–20:00 Jun 5 17:00–21:00 Jun 6 17:00–21:00 Jun 7 19:00–23:00 Jun 9 17:00–20:00 Jun 10 18:00–21:00 Jun 12 15:00–19:00 Jun 13 16:00–21:00 Jun 15 22:00–24:00 Jun 16 00:00–01:00, 13:00–15:00 Jun 18 15:00–20:00 Jun 20 15:00–19:00 Jun 22 21:00–24:00 Jun 23 00:00–03:00 Jun 24 19:00–20:00 Jun 27 13:00–18:00
July
Jul 1 21:00–24:00 Jul 2 17:00–21:00 Jul 3 22:00–24:00 Jul 4 00:00–03:00, 14:00–19:00 Jul 7 16:00–21:00 Jul 10 18:00–22:00 Jul 11 18:00–21:00 Jul 13 16:00–21:00 Jul 14 17:00–21:00 Jul 15 19:00–22:00 Jul 18 18:00–23:00 Jul 20 19:00–24:00 Jul 21 15:00–19:00 Jul 22 18:00–22:00 Jul 24 19:00–23:00 Jul 25 11:00–18:00 Jul 26 17:00–22:00 Jul 27 17:00–21:00 Jul 29 18:00–21:00 Jul 31 18:00–21:00
August
Aug 4 18:00–22:00 Aug 5 18:00–22:00 Aug 6 15:00–20:00 Aug 8 17:00–22:00 Aug 9 20:00–24:00 Aug 10 00:00–01:00, 12:00–16:00 Aug 12 15:00–20:00 Aug 13 12:00–15:00 Aug 16 16:00–21:00 Aug 19 16:00–21:00 Aug 21 15:00–19:00 Aug 22 20:00–24:00 Aug 23 23:00–24:00 Aug 24 00:00–03:00, 14:00–17:00 Aug 26 16:00–21:00 Aug 28 16:00–21:00 Aug 30 00:00–05:00, 20:00–23:00 Aug 31 13:00–16:00
September
Sep 2 16:00–20:00 Sep 4 22:00–24:00 Sep 5 00:00–02:00, 14:00–19:00 Sep 7 16:00–19:00 Sep 9 16:00–19:00 Sep 11 12:00–18:00 Sep 13 17:00–22:00 Sep 14 12:00–17:00 Sep 15 23:00–24:00 Sep 16 00:00–02:00, 16:00–19:00 Sep 17 22:00–24:00 Sep 18 16:00–20:00 Sep 19 17:00–22:00 Sep 21 20:00–23:00 Sep 22 13:00–20:00 Sep 24 15:00–19:00 Sep 25 18:00–21:00 Sep 27 17:00–22:00 Sep 30 21:00–24:00
October
Oct 1 00:00–01:00 Oct 2 15:00–18:00 Oct 4 15:00–21:00 Oct 5 15:00–18:00 Oct 7 17:00–21:00 Oct 9 15:00–19:00 Oct 10 23:00–24:00 Oct 11 00:00–03:00, 17:00–21:00 Oct 15 13:00–18:00 Oct 16 21:00–24:00 Oct 17 00:00–01:00, 15:00–20:00 Oct 19 18:00–21:00 Oct 20 16:00–19:00 Oct 21 12:00–17:00 Oct 22 15:00–19:00 Oct 25 01:00–07:00, 22:00–24:00 Oct 26 00:00–01:00 Oct 28 12:00–19:00 Oct 30 14:00–18:00
November
Nov 2 20:00–24:00 Nov 3 00:00–01:00, 18:00–23:00 Nov 4 13:00–18:00 Nov 6 14:00–19:00 Nov 7 23:00–24:00 Nov 8 00:00–03:00, 18:00–22:00 Nov 9 14:00–19:00 Nov 10 15:00–20:00 Nov 12 13:00–16:00 Nov 13 16:00–18:00 Nov 14 17:00–18:00 Nov 16 19:00–24:00 Nov 17 16:00–21:00 Nov 18 16:00–19:00 Nov 20 18:00–22:00 Nov 21 16:00–20:00 Nov 22 14:00–18:00 Nov 23 12:00–16:00 Nov 25 16:00–19:00 Nov 27 15:00–20:00
December
Dec 1 19:00–23:00 Dec 2 15:00–20:00 Dec 4 18:00–23:00 Dec 5 10:00–14:00 Dec 6 16:00–18:00 Dec 10 15:00–20:00 Dec 12 03:00–08:00, 18:00–20:00 Dec 13 11:00–16:00 Dec 14 18:00–22:00 Dec 15 15:00–19:00 Dec 17 11:00–16:00 Dec 19 16:00–20:00 Dec 21 16:00–20:00 Dec 22 14:00–18:00 Dec 23 15:00–19:00 Dec 24 16:00–20:00 Dec 27 16:00–21:00 Dec 28 16:00–20:00 Dec 29 17:00–20:00