Most often in May, 27 days.
Highest follower count seen that year: 23,007.
January
Jan 3 21:00–23:00 Jan 4 20:00–23:00 Jan 5 20:00–24:00 Jan 6 19:00–23:00 Jan 9 21:00–24:00 Jan 10 21:00–24:00 Jan 11 21:00–24:00 Jan 12 21:00–23:00 Jan 13 21:00–23:00 Jan 15 19:00–21:00 Jan 17 22:00–24:00 Jan 18 21:00–23:00 Jan 21 21:00–24:00 Jan 22 21:00–23:00 Jan 23 21:00–22:00 Jan 24 20:00–22:00 Jan 27 22:00–24:00 Jan 28 00:00–01:00 Jan 30 18:00–19:00
February
Feb 4 21:00–22:00 Feb 8 00:00–01:00, 20:00–22:00 Feb 9 21:00–24:00 Feb 10 21:00–23:00 Feb 11 20:00–22:00 Feb 12 21:00–22:00 Feb 13 21:00–23:00 Feb 14 20:00–24:00 Feb 15 18:00–21:00 Feb 17 14:00–16:00 Feb 18 21:00–22:00 Feb 19 20:00–24:00 Feb 20 20:00–24:00 Feb 21 21:00–22:00 Feb 22 21:00–23:00 Feb 23 20:00–22:00 Feb 24 12:00–15:00 Feb 26 13:00–15:00 Feb 27 20:00–21:00
March
Mar 3 13:00–16:00 Mar 4 14:00–16:00 Mar 5 13:00–14:00, 20:00–23:00 Mar 6 14:00–15:00, 21:00–22:00 Mar 7 13:00–15:00, 20:00–22:00 Mar 8 20:00–23:00 Mar 9 20:00–23:00 Mar 10 20:00–22:00 Mar 11 20:00–23:00 Mar 12 20:00–22:00 Mar 13 13:00–16:00, 20:00–21:00 Mar 14 20:00–23:00 Mar 15 19:00–22:00 Mar 17 20:00–23:00 Mar 19 19:00–23:00 Mar 20 13:00–14:00, 20:00–22:00 Mar 21 20:00–21:00 Mar 22 13:00–15:00, 21:00–23:00 Mar 23 13:00–15:00 Mar 24 13:00–15:00, 20:00–22:00 Mar 25 21:00–24:00 Mar 26 13:00–16:00, 21:00–23:00 Mar 27 20:00–22:00 Mar 28 13:00–14:00, 20:00–23:00 Mar 29 13:00–15:00, 20:00–22:00 Mar 30 13:00–17:00, 22:00–23:00 Mar 31 14:00–15:00
April
Apr 2 13:00–16:00 Apr 3 13:00–16:00 Apr 4 13:00–16:00 Apr 5 13:00–16:00, 21:00–22:00 Apr 6 13:00–16:00 Apr 8 13:00–15:00 Apr 9 13:00–16:00 Apr 10 13:00–16:00 Apr 11 13:00–15:00 Apr 12 13:00–14:00, 20:00–21:00 Apr 13 13:00–16:00 Apr 14 13:00–14:00 Apr 15 13:00–15:00 Apr 17 13:00–15:00 Apr 19 13:00–17:00 Apr 20 13:00–15:00 Apr 21 13:00–15:00 Apr 23 13:00–14:00 Apr 24 20:00–21:00 Apr 25 14:00–15:00 Apr 26 13:00–16:00 Apr 27 13:00–16:00 Apr 28 13:00–14:00 Apr 29 13:00–15:00 Apr 30 13:00–16:00
May
May 3 13:00–16:00 May 4 13:00–16:00, 20:00–21:00 May 5 13:00–15:00 May 6 20:00–22:00 May 7 13:00–17:00 May 8 20:00–21:00 May 9 13:00–17:00 May 10 13:00–17:00 May 11 13:00–17:00 May 12 13:00–17:00 May 13 13:00–16:00 May 15 13:00–17:00 May 16 13:00–16:00 May 17 12:00–16:00 May 18 15:00–16:00 May 19 12:00–15:00, 20:00–21:00 May 21 13:00–15:00, 21:00–23:00 May 22 13:00–16:00, 20:00–22:00 May 23 13:00–15:00, 20:00–23:00 May 24 13:00–16:00, 20:00–23:00 May 25 13:00–16:00 May 26 20:00–22:00 May 27 10:00–12:00 May 28 13:00–15:00, 20:00–22:00 May 29 13:00–15:00 May 30 11:00–15:00, 20:00–23:00 May 31 13:00–15:00
June
Jun 1 13:00–15:00 Jun 3 12:00–15:00 Jun 4 12:00–15:00, 20:00–22:00 Jun 5 11:00–14:00, 20:00–22:00 Jun 6 12:00–14:00, 20:00–22:00 Jun 7 12:00–15:00, 20:00–22:00 Jun 8 12:00–14:00, 20:00–22:00 Jun 10 12:00–14:00 Jun 11 12:00–14:00, 21:00–23:00 Jun 12 13:00–15:00, 21:00–23:00 Jun 13 12:00–15:00, 21:00–22:00 Jun 14 13:00–15:00, 21:00–23:00 Jun 15 13:00–15:00, 21:00–22:00 Jun 18 12:00–15:00 Jun 19 20:00–23:00 Jun 20 12:00–14:00, 20:00–23:00 Jun 21 12:00–15:00, 21:00–23:00 Jun 22 12:00–15:00, 21:00–23:00 Jun 23 13:00–15:00, 20:00–23:00 Jun 24 21:00–22:00 Jun 25 20:00–22:00 Jun 26 20:00–23:00 Jun 27 12:00–15:00, 21:00–22:00 Jun 28 21:00–23:00 Jun 29 12:00–15:00, 20:00–23:00 Jun 30 12:00–14:00, 20:00–21:00
July
Jul 1 21:00–22:00 Jul 2 12:00–14:00, 23:00–24:00 Jul 4 13:00–14:00, 20:00–22:00 Jul 5 12:00–15:00, 21:00–23:00 Jul 6 13:00–15:00, 21:00–22:00 Jul 7 12:00–14:00, 21:00–22:00 Jul 8 13:00–14:00, 21:00–22:00 Jul 9 21:00–22:00 Jul 10 12:00–15:00, 20:00–22:00 Jul 11 12:00–15:00, 21:00–22:00 Jul 12 12:00–14:00, 21:00–23:00 Jul 13 13:00–15:00, 21:00–23:00 Jul 14 12:00–14:00 Jul 15 12:00–15:00, 21:00–23:00 Jul 18 12:00–13:00 Jul 19 12:00–14:00, 21:00–23:00 Jul 20 12:00–13:00, 22:00–23:00 Jul 21 12:00–15:00 Jul 24 21:00–23:00 Jul 25 13:00–14:00 Jul 26 13:00–15:00 Jul 27 13:00–15:00, 21:00–23:00 Jul 28 13:00–14:00 Jul 29 10:00–11:00, 13:00–15:00, 21:00–22:00 Jul 30 09:00–10:00 Jul 31 13:00–14:00, 21:00–22:00
August
Aug 1 12:00–13:00 Aug 2 13:00–14:00 Aug 3 13:00–14:00, 21:00–23:00 Aug 5 12:00–14:00, 21:00–22:00 Aug 6 13:00–14:00, 21:00–22:00 Aug 7 13:00–15:00 Aug 8 13:00–14:00 Aug 9 12:00–15:00, 22:00–23:00 Aug 10 12:00–15:00, 21:00–22:00 Aug 11 12:00–13:00 Aug 12 12:00–15:00 Aug 13 12:00–14:00, 20:00–21:00 Aug 14 12:00–15:00 Aug 15 08:00–09:00, 12:00–15:00 Aug 16 19:00–20:00 Aug 19 13:00–14:00 Aug 21 13:00–15:00 Aug 22 13:00–15:00, 21:00–22:00 Aug 23 12:00–14:00 Aug 24 13:00–15:00, 20:00–22:00 Aug 25 14:00–15:00 Aug 26 21:00–22:00 Aug 27 13:00–14:00 Aug 28 13:00–14:00 Aug 29 13:00–14:00 Aug 30 13:00–15:00
September
Sep 2 13:00–14:00 Sep 4 13:00–15:00 Sep 5 13:00–14:00, 21:00–22:00 Sep 9 13:00–15:00 Sep 10 09:00–10:00 Sep 11 21:00–22:00 Sep 12 13:00–16:00, 21:00–22:00 Sep 13 13:00–14:00, 21:00–22:00 Sep 14 12:00–14:00, 20:00–22:00 Sep 18 13:00–15:00 Sep 19 13:00–15:00 Sep 20 21:00–22:00 Sep 21 13:00–15:00 Sep 22 13:00–14:00 Sep 23 13:00–15:00 Sep 24 13:00–15:00 Sep 25 13:00–14:00 Sep 26 21:00–22:00 Sep 27 13:00–15:00, 21:00–22:00 Sep 28 13:00–15:00 Sep 29 13:00–14:00 Sep 30 13:00–14:00, 21:00–22:00
October
Oct 3 13:00–14:00, 21:00–22:00 Oct 4 21:00–22:00 Oct 5 13:00–14:00, 21:00–22:00 Oct 6 21:00–22:00 Oct 7 13:00–16:00 Oct 8 13:00–15:00 Oct 9 13:00–15:00 Oct 10 13:00–14:00, 21:00–22:00 Oct 11 13:00–15:00, 21:00–22:00 Oct 12 13:00–15:00, 21:00–23:00 Oct 13 13:00–15:00, 21:00–22:00 Oct 14 13:00–14:00, 20:00–21:00 Oct 15 13:00–15:00 Oct 17 13:00–15:00, 21:00–22:00 Oct 18 13:00–15:00, 21:00–22:00 Oct 19 13:00–14:00 Oct 21 13:00–15:00 Oct 23 21:00–22:00 Oct 24 13:00–14:00, 22:00–23:00 Oct 25 13:00–15:00, 21:00–23:00 Oct 26 14:00–15:00, 21:00–22:00 Oct 27 13:00–14:00, 20:00–21:00 Oct 28 14:00–15:00 Oct 29 13:00–14:00, 21:00–22:00 Oct 30 13:00–14:00, 21:00–22:00 Oct 31 13:00–14:00, 21:00–23:00
November
Nov 1 13:00–15:00, 22:00–23:00 Nov 2 13:00–15:00 Nov 4 13:00–14:00 Nov 5 13:00–14:00 Nov 8 13:00–15:00, 22:00–23:00 Nov 12 13:00–15:00 Nov 14 13:00–14:00, 22:00–23:00 Nov 19 13:00–14:00 Nov 21 21:00–23:00 Nov 22 13:00–15:00, 21:00–23:00 Nov 23 13:00–15:00 Nov 24 21:00–22:00 Nov 26 13:00–15:00 Nov 27 14:00–15:00, 20:00–21:00 Nov 28 12:00–14:00, 21:00–23:00 Nov 29 12:00–15:00, 20:00–22:00 Nov 30 13:00–15:00, 20:00–22:00
December
Dec 3 13:00–14:00, 21:00–22:00 Dec 4 13:00–14:00, 21:00–23:00 Dec 5 13:00–14:00 Dec 6 21:00–22:00 Dec 7 13:00–16:00, 21:00–23:00 Dec 9 13:00–14:00, 20:00–22:00 Dec 10 12:00–14:00, 21:00–23:00 Dec 11 13:00–14:00, 21:00–22:00 Dec 12 13:00–14:00, 20:00–23:00 Dec 13 13:00–15:00, 21:00–22:00 Dec 14 13:00–15:00, 21:00–22:00 Dec 15 13:00–15:00, 21:00–22:00 Dec 17 13:00–14:00 Dec 19 13:00–15:00, 23:00–24:00 Dec 20 00:00–01:00, 13:00–15:00, 21:00–23:00 Dec 21 13:00–15:00 Dec 22 14:00–15:00 Dec 23 13:00–15:00, 21:00–22:00 Dec 24 13:00–15:00, 21:00–23:00 Dec 25 13:00–14:00, 21:00–22:00 Dec 26 13:00–15:00, 21:00–23:00 Dec 27 13:00–15:00, 21:00–23:00 Dec 28 13:00–15:00 Dec 29 13:00–15:00 Dec 30 13:00–15:00, 21:00–23:00 Dec 31 13:00–14:00