Most often in July, 24 days.
Highest follower count seen that year: 59,349.
January
Jan 8 12:00–22:00 Jan 9 14:00–22:00 Jan 10 14:00–21:00 Jan 12 14:00–22:00 Jan 13 13:00–22:00 Jan 16 13:00–22:00 Jan 17 13:00–20:00 Jan 18 08:00–09:00, 12:00–17:00 Jan 19 13:00–22:00 Jan 20 15:00–21:00 Jan 22 13:00–22:00 Jan 23 14:00–22:00 Jan 24 14:00–18:00 Jan 26 14:00–19:00 Jan 27 15:00–18:00 Jan 28 12:00–17:00, 19:00–22:00 Jan 29 14:00–22:00 Jan 30 12:00–19:00 Jan 31 14:00–22:00
February
Feb 2 15:00–22:00 Feb 3 14:00–21:00 Feb 5 14:00–21:00 Feb 6 12:00–20:00 Feb 7 14:00–21:00 Feb 9 14:00–21:00 Feb 10 13:00–21:00 Feb 12 14:00–22:00 Feb 13 12:00–18:00 Feb 14 13:00–20:00 Feb 15 13:00–16:00 Feb 16 14:00–21:00 Feb 17 12:00–20:00 Feb 19 14:00–22:00 Feb 20 10:00–17:00 Feb 21 09:00–12:00 Feb 23 16:00–18:00 Feb 26 13:00–19:00 Feb 27 13:00–21:00 Feb 28 11:00–18:00
March
Mar 2 14:00–22:00 Mar 3 14:00–22:00 Mar 5 12:00–18:00 Mar 6 14:00–22:00 Mar 7 14:00–22:00 Mar 9 13:00–22:00 Mar 10 13:00–22:00 Mar 12 13:00–23:00 Mar 13 14:00–23:00 Mar 14 08:00–15:00 Mar 15 18:00–20:00 Mar 16 14:00–22:00 Mar 17 13:00–24:00 Mar 19 14:00–22:00 Mar 20 13:00–22:00 Mar 21 13:00–20:00 Mar 23 14:00–22:00 Mar 24 14:00–22:00 Mar 26 13:00–22:00 Mar 27 12:00–18:00
April
Apr 1 11:00–21:00 Apr 4 09:00–21:00 Apr 6 13:00–23:00 Apr 7 11:00–20:00 Apr 9 14:00–18:00, 21:00–23:00 Apr 10 15:00–24:00 Apr 11 15:00–22:00 Apr 13 17:00–24:00 Apr 14 00:00–01:00, 13:00–21:00 Apr 15 17:00–23:00 Apr 17 14:00–24:00 Apr 18 13:00–18:00 Apr 20 13:00–23:00 Apr 21 14:00–23:00 Apr 22 14:00–23:00 Apr 24 15:00–22:00 Apr 25 14:00–21:00 Apr 27 14:00–23:00 Apr 28 19:00–23:00 Apr 29 16:00–20:00
May
May 1 14:00–22:00 May 2 14:00–21:00 May 4 14:00–23:00 May 5 14:00–23:00 May 6 14:00–22:00 May 7 12:00–20:00 May 9 18:00–21:00 May 11 14:00–24:00 May 12 18:00–22:00 May 14 14:00–23:00 May 15 14:00–22:00 May 16 16:00–23:00 May 18 17:00–23:00 May 19 15:00–22:00 May 21 16:00–24:00 May 22 15:00–22:00 May 23 16:00–22:00 May 25 16:00–23:00 May 26 09:00–11:00, 13:00–18:00 May 31 14:00–22:00
June
Jun 1 13:00–24:00 Jun 2 00:00–01:00, 13:00–21:00 Jun 3 12:00–17:00 Jun 4 11:00–21:00 Jun 5 14:00–21:00 Jun 6 16:00–22:00 Jun 8 12:00–22:00 Jun 9 15:00–22:00 Jun 11 12:00–21:00 Jun 12 11:00–16:00 Jun 13 15:00–19:00 Jun 15 13:00–19:00 Jun 16 09:00–18:00 Jun 17 10:00–23:00 Jun 18 10:00–18:00
July
Jul 1 13:00–22:00 Jul 2 12:00–19:00 Jul 3 14:00–22:00 Jul 4 09:00–15:00 Jul 6 12:00–20:00 Jul 7 13:00–19:00 Jul 9 12:00–18:00 Jul 10 20:00–23:00 Jul 11 11:00–18:00 Jul 13 11:00–19:00 Jul 14 13:00–20:00 Jul 16 09:00–18:00 Jul 17 11:00–20:00 Jul 18 13:00–18:00 Jul 20 15:00–24:00 Jul 21 12:00–19:00 Jul 23 16:00–24:00 Jul 24 11:00–18:00 Jul 25 17:00–20:00 Jul 26 13:00–18:00 Jul 27 18:00–23:00 Jul 28 11:00–18:00 Jul 29 16:00–18:00 Jul 30 06:00–10:00, 12:00–16:00
August
Aug 1 10:00–18:00 Aug 3 11:00–19:00, 21:00–23:00 Aug 4 13:00–19:00 Aug 5 10:00–18:00 Aug 7 12:00–20:00 Aug 8 12:00–16:00 Aug 10 14:00–24:00 Aug 11 10:00–16:00 Aug 13 09:00–17:00, 23:00–24:00 Aug 14 13:00–18:00 Aug 15 21:00–23:00 Aug 21 14:00–23:00 Aug 22 14:00–24:00 Aug 23 09:00–17:00 Aug 25 14:00–17:00 Aug 26 10:00–19:00 Aug 27 11:00–19:00 Aug 29 15:00–24:00 Aug 30 10:00–17:00 Aug 31 12:00–19:00
September
Sep 1 14:00–22:00 Sep 3 14:00–21:00 Sep 4 12:00–20:00 Sep 5 10:00–17:00 Sep 7 14:00–22:00 Sep 8 11:00–18:00 Sep 10 11:00–19:00 Sep 11 15:00–20:00 Sep 12 11:00–18:00 Sep 14 12:00–18:00 Sep 17 12:00–20:00 Sep 18 10:00–18:00 Sep 19 14:00–23:00 Sep 22 11:00–19:00 Sep 23 16:00–22:00 Sep 24 15:00–21:00 Sep 25 13:00–23:00 Sep 26 13:00–19:00 Sep 28 14:00–22:00 Sep 29 11:00–15:00 Sep 30 11:00–12:00
October
Oct 1 14:00–22:00 Oct 2 12:00–19:00 Oct 3 08:00–17:00 Oct 5 15:00–22:00 Oct 6 13:00–22:00 Oct 9 14:00–24:00 Oct 10 14:00–22:00 Oct 12 13:00–19:00 Oct 13 09:00–16:00 Oct 15 14:00–18:00 Oct 16 08:00–11:00, 13:00–20:00 Oct 17 12:00–16:00 Oct 19 11:00–19:00 Oct 20 09:00–11:00, 13:00–19:00 Oct 22 12:00–19:00 Oct 23 10:00–18:00 Oct 24 10:00–18:00 Oct 26 14:00–19:00 Oct 27 10:00–15:00 Oct 29 11:00–18:00 Oct 30 08:00–15:00
November
Nov 2 11:00–18:00 Nov 3 11:00–17:00 Nov 4 10:00–15:00 Nov 5 10:00–17:00 Nov 6 10:00–17:00 Nov 7 10:00–16:00 Nov 9 16:00–20:00 Nov 10 12:00–19:00 Nov 11 11:00–16:00 Nov 12 11:00–16:00, 21:00–23:00 Nov 13 13:00–18:00 Nov 14 12:00–19:00 Nov 16 12:00–21:00 Nov 17 11:00–19:00 Nov 20 15:00–23:00 Nov 21 14:00–19:00 Nov 23 13:00–20:00 Nov 24 09:00–12:00, 16:00–22:00 Nov 25 15:00–21:00 Nov 27 16:00–23:00 Nov 28 13:00–21:00 Nov 29 11:00–20:00
December
Dec 1 12:00–21:00 Dec 2 12:00–13:00, 16:00–23:00 Dec 4 14:00–24:00 Dec 5 15:00–20:00 Dec 8 13:00–21:00 Dec 9 11:00–23:00 Dec 10 10:00–11:00 Dec 12 13:00–22:00 Dec 13 14:00–23:00 Dec 14 13:00–20:00 Dec 16 13:00–24:00 Dec 17 15:00–21:00 Dec 19 15:00–23:00 Dec 21 13:00–21:00 Dec 22 14:00–22:00 Dec 24 16:00–23:00 Dec 25 11:00–17:00