Most often in May, 25 days.
Highest follower count seen that year: 4,850.
January
Jan 11 15:00–18:00 Jan 15 16:00–17:00 Jan 16 07:00–09:00, 16:00–18:00 Jan 17 15:00–16:00 Jan 18 16:00–18:00 Jan 20 16:00–17:00 Jan 21 06:00–08:00 Jan 22 16:00–20:00 Jan 23 16:00–18:00 Jan 24 14:00–19:00 Jan 27 16:00–20:00, 22:00–23:00 Jan 28 18:00–19:00 Jan 29 16:00–18:00 Jan 30 17:00–20:00 Jan 31 09:00–17:00
February
Feb 1 15:00–18:00 Feb 3 18:00–21:00 Feb 4 15:00–17:00 Feb 5 17:00–20:00 Feb 7 05:00–09:00, 18:00–21:00 Feb 10 17:00–21:00 Feb 11 15:00–20:00 Feb 12 17:00–21:00 Feb 13 11:00–14:00, 17:00–20:00 Feb 14 16:00–19:00 Feb 15 16:00–21:00 Feb 17 16:00–21:00 Feb 18 09:00–12:00, 17:00–20:00 Feb 19 18:00–23:00 Feb 20 18:00–22:00 Feb 21 18:00–20:00 Feb 22 17:00–21:00 Feb 25 16:00–21:00 Feb 26 15:00–18:00 Feb 28 15:00–20:00
March
Mar 1 14:00–21:00 Mar 3 16:00–20:00 Mar 4 16:00–17:00 Mar 5 19:00–20:00 Mar 8 13:00–17:00 Mar 10 16:00–17:00 Mar 11 12:00–20:00 Mar 14 17:00–19:00 Mar 15 09:00–12:00, 18:00–22:00 Mar 17 15:00–20:00 Mar 18 15:00–20:00 Mar 19 17:00–20:00 Mar 20 15:00–19:00 Mar 21 11:00–12:00, 17:00–20:00 Mar 27 15:00–17:00 Mar 29 14:00–16:00 Mar 31 15:00–17:00
April
Apr 1 14:00–17:00 Apr 2 15:00–17:00 Apr 3 14:00–17:00 Apr 4 15:00–17:00 Apr 5 17:00–19:00 Apr 7 16:00–17:00 Apr 9 17:00–18:00 Apr 10 15:00–18:00 Apr 11 15:00–17:00 Apr 12 15:00–18:00 Apr 14 15:00–18:00 Apr 16 17:00–19:00 Apr 17 11:00–17:00 Apr 18 12:00–14:00 Apr 22 14:00–18:00 Apr 23 13:00–21:00 Apr 24 14:00–19:00 Apr 25 16:00–20:00 Apr 26 15:00–18:00 Apr 29 16:00–19:00 Apr 30 15:00–18:00
May
May 1 15:00–17:00 May 2 15:00–19:00 May 3 15:00–18:00 May 5 16:00–19:00 May 6 12:00–19:00 May 7 14:00–20:00 May 8 14:00–17:00 May 9 14:00–17:00 May 10 14:00–18:00 May 12 15:00–18:00 May 13 15:00–18:00 May 15 16:00–17:00 May 16 15:00–19:00 May 17 13:00–16:00 May 20 14:00–17:00 May 21 17:00–21:00 May 22 15:00–20:00 May 23 07:00–11:00, 13:00–19:00 May 24 07:00–12:00, 14:00–17:00 May 25 10:00–20:00 May 26 08:00–10:00, 12:00–21:00 May 27 10:00–11:00, 13:00–21:00 May 28 14:00–15:00, 18:00–19:00 May 30 17:00–19:00 May 31 09:00–14:00
June
Jun 1 06:00–08:00, 14:00–18:00 Jun 2 10:00–18:00 Jun 3 16:00–20:00 Jun 4 15:00–19:00 Jun 5 15:00–20:00 Jun 6 15:00–20:00 Jun 7 13:00–19:00 Jun 8 12:00–18:00 Jun 9 14:00–17:00 Jun 10 15:00–19:00 Jun 12 16:00–18:00 Jun 13 16:00–19:00 Jun 14 14:00–17:00 Jun 16 18:00–20:00 Jun 17 14:00–17:00 Jun 19 12:00–14:00 Jun 24 15:00–18:00 Jun 25 15:00–18:00 Jun 27 13:00–20:00 Jun 28 15:00–18:00 Jun 29 10:00–11:00, 15:00–20:00 Jun 30 15:00–17:00
July
Jul 2 14:00–17:00 Jul 4 15:00–18:00 Jul 5 14:00–17:00 Jul 7 15:00–18:00 Jul 8 14:00–18:00 Jul 9 15:00–17:00 Jul 12 13:00–17:00 Jul 14 15:00–18:00 Jul 16 15:00–20:00 Jul 17 15:00–19:00 Jul 18 15:00–18:00
August
Aug 13 08:00–13:00 Aug 14 03:00–05:00 Aug 15 07:00–12:00, 15:00–18:00 Aug 16 07:00–10:00, 15:00–17:00 Aug 18 07:00–12:00, 14:00–18:00 Aug 19 07:00–10:00, 15:00–19:00 Aug 20 07:00–12:00, 16:00–18:00 Aug 21 07:00–10:00, 16:00–17:00 Aug 22 08:00–10:00, 17:00–18:00 Aug 23 07:00–10:00, 16:00–18:00 Aug 25 08:00–09:00 Aug 26 17:00–19:00 Aug 27 07:00–11:00, 17:00–19:00 Aug 28 03:00–05:00, 18:00–19:00 Aug 29 04:00–05:00, 16:00–17:00 Aug 30 08:00–10:00
September
Sep 1 07:00–10:00, 15:00–17:00 Sep 2 08:00–10:00, 15:00–16:00 Sep 3 04:00–08:00, 15:00–18:00 Sep 4 07:00–10:00, 16:00–19:00 Sep 5 09:00–11:00, 14:00–17:00 Sep 6 15:00–18:00 Sep 8 15:00–18:00 Sep 9 07:00–12:00, 16:00–19:00 Sep 10 08:00–10:00, 15:00–17:00 Sep 11 08:00–09:00, 15:00–18:00 Sep 12 07:00–11:00, 15:00–19:00 Sep 13 08:00–13:00, 15:00–18:00 Sep 15 08:00–10:00 Sep 16 07:00–11:00, 16:00–18:00 Sep 18 15:00–17:00 Sep 20 07:00–10:00 Sep 23 04:00–11:00 Sep 24 05:00–11:00 Sep 25 05:00–10:00 Sep 26 06:00–11:00 Sep 27 06:00–10:00 Sep 29 07:00–10:00 Sep 30 08:00–11:00
October
Oct 1 08:00–11:00 Oct 2 07:00–10:00 Oct 3 08:00–11:00 Oct 4 08:00–10:00 Oct 9 08:00–10:00 Oct 10 09:00–11:00 Oct 11 08:00–10:00 Oct 14 08:00–10:00 Oct 15 08:00–10:00 Oct 16 08:00–10:00 Oct 17 09:00–11:00 Oct 18 08:00–11:00 Oct 25 07:00–09:00 Oct 27 09:00–10:00 Oct 28 07:00–10:00 Oct 29 08:00–10:00 Oct 30 07:00–13:00 Oct 31 08:00–11:00
November
Nov 1 07:00–09:00 Nov 4 09:00–11:00 Nov 5 09:00–11:00 Nov 7 09:00–11:00 Nov 8 08:00–11:00 Nov 10 07:00–12:00 Nov 11 08:00–11:00 Nov 12 08:00–10:00 Nov 13 07:00–11:00 Nov 14 08:00–10:00 Nov 15 08:00–11:00 Nov 17 08:00–11:00 Nov 18 08:00–11:00 Nov 19 09:00–11:00 Nov 20 08:00–10:00 Nov 21 08:00–11:00 Nov 22 07:00–11:00 Nov 24 08:00–10:00 Nov 25 07:00–11:00 Nov 26 08:00–11:00 Nov 27 09:00–11:00 Nov 28 08:00–12:00 Nov 29 09:00–11:00
December
Dec 1 08:00–12:00 Dec 2 08:00–11:00 Dec 3 09:00–11:00 Dec 4 08:00–11:00 Dec 8 08:00–11:00 Dec 9 09:00–10:00 Dec 10 09:00–11:00 Dec 11 08:00–11:00 Dec 12 07:00–08:00 Dec 15 07:00–10:00 Dec 16 10:00–12:00 Dec 17 08:00–12:00 Dec 18 09:00–12:00 Dec 19 07:00–09:00 Dec 20 08:00–11:00 Dec 22 09:00–11:00 Dec 23 09:00–10:00 Dec 24 09:00–11:00 Dec 25 09:00–10:00 Dec 26 08:00–11:00 Dec 27 09:00–12:00 Dec 29 08:00–12:00 Dec 30 13:00–15:00 Dec 31 07:00–10:00