Most often in October, 23 days.
Highest follower count seen that year: 38,732.
January
Jan 2 06:00–13:00 Jan 3 06:00–14:00 Jan 6 07:00–14:00 Jan 7 07:00–15:00 Jan 8 06:00–15:00 Jan 9 07:00–15:00 Jan 10 09:00–13:00 Jan 11 08:00–12:00 Jan 13 07:00–13:00 Jan 15 07:00–15:00 Jan 16 06:00–13:00 Jan 17 07:00–10:00, 12:00–15:00 Jan 20 07:00–14:00 Jan 21 07:00–14:00 Jan 22 07:00–15:00 Jan 23 07:00–15:00 Jan 24 07:00–10:00 Jan 25 07:00–11:00 Jan 27 07:00–15:00 Jan 28 07:00–14:00 Jan 29 07:00–13:00 Jan 30 09:00–14:00 Jan 31 07:00–14:00
February
Feb 3 07:00–14:00 Feb 4 07:00–15:00 Feb 5 07:00–14:00 Feb 6 07:00–14:00 Feb 7 07:00–14:00 Feb 10 06:00–15:00 Feb 11 07:00–15:00 Feb 12 06:00–14:00 Feb 13 06:00–14:00 Feb 14 06:00–15:00 Feb 17 06:00–13:00 Feb 18 06:00–15:00 Feb 19 07:00–15:00 Feb 20 06:00–15:00 Feb 21 07:00–13:00 Feb 25 06:00–15:00 Feb 26 06:00–15:00 Feb 27 07:00–14:00 Feb 28 06:00–16:00
March
Mar 3 06:00–14:00 Mar 4 06:00–13:00 Mar 5 09:00–15:00 Mar 6 06:00–15:00 Mar 7 06:00–11:00, 13:00–15:00 Mar 8 07:00–12:00 Mar 10 06:00–13:00 Mar 11 06:00–14:00 Mar 12 07:00–13:00 Mar 13 06:00–15:00 Mar 14 07:00–16:00 Mar 17 06:00–14:00 Mar 18 06:00–14:00 Mar 19 06:00–13:00 Mar 20 06:00–14:00 Mar 21 07:00–08:00, 11:00–13:00 Mar 24 06:00–13:00 Mar 25 06:00–13:00 Mar 26 06:00–13:00 Mar 27 06:00–13:00 Mar 28 07:00–13:00 Mar 31 06:00–15:00
April
Apr 1 06:00–14:00 Apr 2 06:00–14:00 Apr 3 06:00–13:00 Apr 4 06:00–14:00 Apr 7 09:00–14:00 Apr 8 07:00–13:00 Apr 9 06:00–13:00 Apr 10 06:00–13:00 Apr 11 06:00–14:00 Apr 14 06:00–13:00 Apr 15 06:00–14:00 Apr 16 06:00–13:00 Apr 17 06:00–13:00 Apr 18 06:00–14:00 Apr 21 07:00–13:00 Apr 22 06:00–13:00 Apr 23 06:00–14:00 Apr 24 06:00–13:00 Apr 25 07:00–13:00 Apr 28 07:00–14:00 Apr 29 08:00–14:00 Apr 30 06:00–08:00, 10:00–13:00
May
May 1 06:00–13:00 May 2 07:00–14:00 May 5 06:00–13:00 May 6 06:00–12:00 May 7 06:00–13:00 May 8 06:00–14:00 May 9 06:00–15:00 May 12 08:00–13:00 May 13 08:00–14:00 May 14 07:00–13:00 May 15 09:00–14:00 May 16 06:00–13:00 May 17 08:00–13:00 May 20 06:00–13:00 May 21 06:00–13:00 May 22 07:00–14:00 May 23 06:00–14:00 May 27 06:00–14:00 May 28 06:00–14:00 May 29 06:00–13:00 May 30 06:00–15:00
June
Jun 3 06:00–14:00 Jun 4 06:00–15:00 Jun 5 07:00–13:00 Jun 6 06:00–14:00 Jun 9 06:00–16:00 Jun 10 06:00–14:00 Jun 11 06:00–12:00 Jun 12 09:00–15:00 Jun 13 06:00–14:00 Jun 16 08:00–15:00 Jun 18 08:00–16:00 Jun 19 07:00–13:00 Jun 20 06:00–13:00 Jun 23 06:00–14:00 Jun 24 06:00–13:00 Jun 25 06:00–13:00 Jun 26 06:00–13:00 Jun 27 06:00–13:00 Jun 30 06:00–14:00
July
Jul 1 06:00–14:00 Jul 2 07:00–12:00 Jul 3 06:00–16:00 Jul 4 06:00–15:00 Jul 7 07:00–14:00 Jul 8 06:00–14:00 Jul 10 06:00–16:00 Jul 11 07:00–13:00 Jul 14 07:00–14:00 Jul 15 06:00–12:00 Jul 25 06:00–15:00 Jul 26 06:00–15:00 Jul 28 06:00–13:00 Jul 29 06:00–13:00 Jul 30 06:00–14:00 Jul 31 06:00–16:00
August
Aug 1 06:00–13:00 Aug 4 06:00–13:00 Aug 5 06:00–14:00 Aug 6 06:00–14:00 Aug 7 06:00–14:00 Aug 8 09:00–15:00 Aug 11 06:00–14:00 Aug 12 06:00–14:00 Aug 13 06:00–14:00 Aug 14 06:00–16:00 Aug 15 06:00–18:00 Aug 18 07:00–15:00 Aug 19 06:00–14:00 Aug 20 06:00–13:00 Aug 21 06:00–14:00 Aug 22 06:00–14:00 Aug 25 06:00–07:00, 10:00–13:00 Aug 26 06:00–08:00, 10:00–15:00 Aug 27 06:00–13:00 Aug 28 07:00–14:00 Aug 29 06:00–14:00
September
Sep 1 06:00–13:00 Sep 2 06:00–13:00 Sep 3 07:00–13:00 Sep 4 06:00–15:00 Sep 5 07:00–14:00 Sep 8 06:00–15:00 Sep 9 06:00–17:00 Sep 10 06:00–15:00 Sep 11 06:00–16:00 Sep 12 06:00–15:00 Sep 15 07:00–16:00 Sep 16 06:00–13:00 Sep 17 06:00–14:00 Sep 18 06:00–13:00 Sep 19 07:00–13:00 Sep 22 06:00–14:00 Sep 23 06:00–13:00 Sep 24 06:00–14:00 Sep 25 06:00–14:00 Sep 26 06:00–13:00 Sep 29 06:00–13:00 Sep 30 06:00–14:00
October
Oct 1 06:00–14:00 Oct 2 06:00–14:00 Oct 3 07:00–14:00 Oct 6 06:00–13:00 Oct 7 07:00–15:00 Oct 8 06:00–15:00 Oct 9 06:00–13:00 Oct 10 07:00–15:00 Oct 13 06:00–14:00 Oct 14 06:00–13:00 Oct 15 07:00–14:00 Oct 16 07:00–13:00 Oct 17 06:00–13:00 Oct 20 06:00–13:00 Oct 21 06:00–15:00 Oct 22 07:00–15:00 Oct 23 06:00–15:00 Oct 24 07:00–13:00 Oct 27 06:00–14:00 Oct 28 06:00–13:00 Oct 29 07:00–13:00 Oct 30 06:00–16:00 Oct 31 06:00–15:00
November
Nov 3 06:00–13:00 Nov 4 06:00–14:00 Nov 5 07:00–15:00 Nov 6 07:00–15:00 Nov 7 06:00–15:00 Nov 10 07:00–15:00 Nov 11 07:00–14:00 Nov 12 07:00–16:00 Nov 13 07:00–15:00 Nov 14 06:00–15:00 Nov 15 07:00–12:00 Nov 17 07:00–14:00 Nov 18 06:00–14:00 Nov 19 06:00–14:00 Nov 20 07:00–14:00 Nov 21 07:00–13:00 Nov 24 07:00–13:00 Nov 25 07:00–15:00 Nov 26 08:00–15:00 Nov 27 07:00–14:00 Nov 28 06:00–13:00
December
Dec 1 06:00–13:00 Dec 2 06:00–15:00 Dec 3 07:00–15:00 Dec 4 06:00–15:00 Dec 5 06:00–15:00 Dec 8 06:00–15:00 Dec 9 06:00–15:00 Dec 10 06:00–16:00 Dec 11 06:00–15:00 Dec 12 06:00–14:00 Dec 15 07:00–15:00 Dec 16 09:00–15:00 Dec 17 06:00–15:00 Dec 18 06:00–15:00 Dec 19 06:00–15:00 Dec 22 06:00–14:00 Dec 23 07:00–13:00 Dec 24 07:00–14:00 Dec 25 06:00–15:00 Dec 26 06:00–15:00 Dec 29 07:00–15:00 Dec 30 07:00–14:00