Most often in May, 27 days.
Highest follower count seen that year: 11,805.
January
Jan 1 16:00–17:00 Jan 2 15:00–16:00, 23:00–24:00 Jan 3 14:00–15:00 Jan 6 13:00–14:00, 20:00–21:00 Jan 7 14:00–15:00 Jan 8 15:00–16:00, 23:00–24:00 Jan 9 14:00–15:00 Jan 10 22:00–23:00 Jan 11 15:00–16:00 Jan 12 14:00–15:00 Jan 13 14:00–15:00 Jan 14 15:00–16:00 Jan 15 13:00–14:00 Jan 17 14:00–15:00 Jan 18 11:00–12:00, 16:00–17:00 Jan 20 14:00–15:00 Jan 21 13:00–14:00, 19:00–20:00 Jan 22 14:00–15:00 Jan 23 19:00–20:00 Jan 27 12:00–13:00 Jan 29 12:00–13:00 Jan 30 12:00–13:00 Jan 31 15:00–16:00
February
Feb 1 14:00–15:00 Feb 2 14:00–15:00 Feb 3 13:00–14:00, 18:00–19:00 Feb 4 15:00–16:00 Feb 5 16:00–17:00 Feb 6 14:00–15:00 Feb 7 23:00–24:00 Feb 8 20:00–21:00 Feb 9 15:00–16:00, 21:00–22:00 Feb 10 13:00–14:00 Feb 11 14:00–15:00, 23:00–24:00 Feb 12 13:00–14:00 Feb 13 14:00–15:00 Feb 15 14:00–15:00 Feb 16 14:00–15:00 Feb 18 14:00–15:00 Feb 19 13:00–14:00 Feb 21 16:00–17:00 Feb 22 18:00–19:00 Feb 25 17:00–18:00 Feb 27 13:00–14:00 Feb 28 13:00–14:00
March
Mar 1 15:00–16:00 Mar 2 15:00–16:00 Mar 4 13:00–14:00, 21:00–22:00 Mar 5 14:00–15:00 Mar 6 14:00–15:00 Mar 8 16:00–17:00 Mar 9 14:00–15:00 Mar 11 13:00–14:00 Mar 12 13:00–14:00, 20:00–21:00 Mar 13 18:00–19:00 Mar 15 12:00–13:00, 17:00–18:00 Mar 17 12:00–13:00 Mar 18 12:00–13:00 Mar 19 12:00–13:00 Mar 20 19:00–20:00 Mar 21 12:00–13:00 Mar 22 13:00–14:00 Mar 23 13:00–14:00 Mar 24 13:00–14:00 Mar 26 12:00–13:00 Mar 27 11:00–12:00 Mar 28 12:00–13:00 Mar 29 13:00–14:00 Mar 30 14:00–15:00
April
Apr 2 13:00–14:00, 18:00–19:00 Apr 3 13:00–14:00 Apr 8 12:00–13:00, 23:00–24:00 Apr 9 22:00–23:00 Apr 11 11:00–12:00 Apr 13 14:00–15:00 Apr 14 11:00–12:00 Apr 15 12:00–13:00 Apr 16 13:00–14:00 Apr 17 13:00–14:00, 20:00–21:00 Apr 18 13:00–14:00 Apr 21 12:00–13:00 Apr 23 13:00–14:00, 21:00–22:00 Apr 24 18:00–19:00 Apr 25 13:00–14:00, 20:00–21:00 Apr 26 16:00–17:00 Apr 27 14:00–15:00 Apr 28 13:00–14:00 Apr 29 14:00–15:00, 22:00–23:00 Apr 30 12:00–13:00
May
May 1 13:00–15:00 May 3 18:00–19:00 May 4 13:00–14:00 May 5 13:00–14:00, 21:00–22:00 May 6 11:00–12:00 May 7 13:00–14:00 May 8 12:00–13:00, 20:00–21:00 May 9 12:00–13:00 May 10 13:00–14:00 May 11 16:00–17:00 May 13 13:00–14:00 May 14 13:00–14:00, 22:00–23:00 May 16 12:00–13:00 May 17 15:00–16:00, 21:00–22:00 May 18 23:00–24:00 May 19 12:00–13:00 May 20 13:00–14:00 May 21 12:00–13:00 May 22 12:00–13:00 May 23 13:00–14:00 May 24 14:00–15:00, 21:00–22:00 May 25 12:00–13:00, 19:00–20:00 May 26 12:00–13:00, 21:00–22:00 May 27 11:00–12:00 May 28 12:00–13:00 May 29 12:00–13:00 May 31 13:00–14:00
June
Jun 2 13:00–14:00 Jun 4 12:00–13:00, 21:00–22:00 Jun 5 12:00–13:00 Jun 7 21:00–22:00 Jun 8 13:00–14:00, 21:00–22:00 Jun 10 11:00–12:00 Jun 13 15:00–18:00 Jun 14 12:00–13:00 Jun 16 11:00–12:00 Jun 17 07:00–08:00, 13:00–14:00, 17:00–18:00 Jun 19 13:00–14:00, 22:00–23:00 Jun 21 14:00–15:00 Jun 22 14:00–15:00 Jun 23 13:00–14:00, 22:00–23:00 Jun 24 13:00–14:00, 21:00–22:00 Jun 25 12:00–13:00 Jun 26 13:00–14:00 Jun 28 16:00–17:00 Jun 29 16:00–17:00 Jun 30 17:00–18:00
July
Jul 1 13:00–14:00 Jul 2 13:00–14:00, 23:00–24:00 Jul 3 13:00–14:00 Jul 4 16:00–17:00 Jul 5 13:00–14:00, 21:00–22:00 Jul 6 15:00–16:00 Jul 7 13:00–14:00, 20:00–21:00 Jul 8 12:00–13:00 Jul 9 13:00–14:00, 22:00–23:00 Jul 10 13:00–14:00 Jul 12 15:00–16:00, 20:00–21:00 Jul 13 15:00–16:00 Jul 14 12:00–13:00 Jul 15 12:00–13:00 Jul 16 13:00–14:00 Jul 17 13:00–14:00 Jul 18 13:00–14:00 Jul 19 12:00–13:00 Jul 20 13:00–14:00 Jul 21 10:00–11:00, 13:00–15:00 Jul 22 11:00–12:00, 17:00–18:00 Jul 23 23:00–24:00 Jul 24 13:00–14:00 Jul 25 18:00–19:00 Jul 26 14:00–15:00 Jul 28 15:00–16:00 Jul 29 13:00–14:00
August
Aug 1 11:00–12:00 Aug 2 11:00–12:00, 21:00–22:00 Aug 3 16:00–17:00 Aug 4 13:00–14:00, 20:00–21:00 Aug 5 12:00–13:00, 20:00–21:00 Aug 6 12:00–13:00 Aug 8 15:00–16:00 Aug 9 13:00–14:00 Aug 10 13:00–14:00 Aug 13 14:00–15:00, 21:00–22:00 Aug 14 12:00–13:00 Aug 15 14:00–15:00 Aug 16 14:00–15:00, 22:00–23:00 Aug 17 16:00–17:00 Aug 18 13:00–14:00, 18:00–19:00 Aug 20 19:00–20:00 Aug 23 19:00–20:00 Aug 24 13:00–14:00 Aug 25 13:00–14:00 Aug 26 23:00–24:00 Aug 27 12:00–13:00 Aug 29 14:00–15:00 Aug 30 14:00–15:00 Aug 31 12:00–13:00
September
Sep 1 14:00–15:00 Sep 3 22:00–23:00 Sep 4 12:00–13:00 Sep 6 13:00–14:00 Sep 7 20:00–21:00 Sep 8 13:00–14:00 Sep 13 10:00–11:00 Sep 14 14:00–15:00, 20:00–21:00 Sep 21 09:00–10:00 Sep 22 23:00–24:00 Sep 23 13:00–14:00 Sep 24 12:00–14:00 Sep 25 13:00–14:00 Sep 26 12:00–13:00 Sep 27 11:00–12:00 Sep 28 12:00–13:00 Sep 29 12:00–13:00 Sep 30 13:00–14:00
October
Oct 2 12:00–13:00 Oct 6 13:00–14:00 Oct 7 11:00–12:00 Oct 8 14:00–15:00, 21:00–22:00 Oct 10 12:00–13:00 Oct 11 13:00–14:00 Oct 13 13:00–14:00 Oct 15 00:00–01:00, 14:00–15:00, 21:00–22:00 Oct 17 13:00–14:00 Oct 18 14:00–15:00 Oct 19 15:00–16:00 Oct 20 13:00–14:00 Oct 21 13:00–14:00, 18:00–19:00 Oct 23 12:00–13:00 Oct 24 13:00–14:00 Oct 25 13:00–14:00 Oct 26 17:00–19:00 Oct 28 13:00–14:00 Oct 29 12:00–13:00, 22:00–23:00 Oct 31 13:00–14:00
November
Nov 1 14:00–15:00 Nov 3 13:00–14:00 Nov 4 13:00–14:00 Nov 5 14:00–15:00 Nov 7 14:00–15:00, 23:00–24:00 Nov 8 17:00–18:00 Nov 10 14:00–15:00 Nov 11 02:00–04:00, 12:00–13:00 Nov 12 14:00–15:00 Nov 13 13:00–14:00, 22:00–23:00 Nov 14 14:00–15:00 Nov 15 15:00–16:00 Nov 16 20:00–21:00 Nov 17 14:00–15:00 Nov 18 07:00–08:00, 14:00–15:00 Nov 19 23:00–24:00 Nov 20 13:00–14:00 Nov 22 14:00–16:00, 20:00–21:00 Nov 23 17:00–18:00 Nov 26 13:00–14:00 Nov 27 16:00–17:00 Nov 28 15:00–16:00 Nov 29 13:00–14:00 Nov 30 15:00–16:00
December
Dec 1 13:00–14:00 Dec 3 13:00–14:00 Dec 5 15:00–16:00 Dec 6 20:00–21:00 Dec 7 19:00–20:00 Dec 8 12:00–13:00 Dec 9 13:00–14:00 Dec 10 11:00–12:00 Dec 11 22:00–23:00 Dec 12 15:00–16:00 Dec 13 12:00–13:00 Dec 14 18:00–19:00 Dec 15 17:00–18:00 Dec 16 14:00–15:00, 19:00–20:00 Dec 19 13:00–14:00 Dec 20 14:00–15:00 Dec 21 20:00–21:00 Dec 22 14:00–15:00 Dec 23 17:00–18:00 Dec 24 16:00–17:00 Dec 26 17:00–18:00 Dec 27 16:00–17:00 Dec 28 17:00–18:00 Dec 29 15:00–16:00 Dec 30 14:00–15:00 Dec 31 16:00–17:00