Most often in May, 25 days.
Highest follower count seen that year: 5,623.
April
Apr 9 09:00–11:00, 17:00–18:00 Apr 10 14:00–19:00 Apr 11 05:00–09:00 Apr 12 05:00–10:00 Apr 13 05:00–10:00, 13:00–17:00 Apr 14 05:00–11:00, 17:00–19:00 Apr 16 05:00–11:00, 17:00–21:00 Apr 17 15:00–19:00 Apr 18 05:00–09:00 Apr 22 05:00–08:00 Apr 23 05:00–10:00, 18:00–22:00 Apr 24 15:00–19:00 Apr 25 18:00–22:00 Apr 27 05:00–09:00 Apr 30 06:00–07:00, 20:00–23:00
May
May 1 14:00–19:00 May 2 05:00–06:00 May 3 05:00–09:00 May 5 05:00–10:00, 17:00–20:00 May 7 05:00–10:00 May 8 06:00–07:00 May 9 05:00–08:00 May 10 05:00–09:00 May 11 05:00–09:00, 14:00–19:00 May 12 14:00–17:00, 19:00–20:00 May 14 05:00–11:00 May 15 05:00–06:00 May 16 05:00–08:00 May 17 14:00–19:00 May 18 19:00–22:00 May 20 05:00–07:00 May 21 06:00–11:00 May 22 05:00–07:00, 15:00–19:00 May 23 06:00–09:00 May 25 14:00–19:00 May 26 06:00–11:00, 15:00–18:00 May 28 05:00–10:00, 15:00–19:00 May 29 15:00–19:00 May 30 05:00–09:00 May 31 05:00–09:00
June
Jun 1 17:00–21:00 Jun 2 14:00–19:00 Jun 4 05:00–11:00, 15:00–16:00, 18:00–19:00 Jun 5 15:00–19:00 Jun 6 05:00–09:00 Jun 7 05:00–10:00 Jun 8 13:00–16:00 Jun 9 05:00–11:00, 15:00–17:00 Jun 10 05:00–08:00 Jun 11 05:00–10:00 Jun 12 14:00–18:00 Jun 18 05:00–08:00, 10:00–11:00, 15:00–19:00 Jun 20 05:00–09:00 Jun 21 05:00–09:00 Jun 22 05:00–07:00 Jun 23 05:00–11:00, 16:00–20:00 Jun 25 05:00–11:00, 15:00–19:00 Jun 26 16:00–19:00 Jun 27 06:00–10:00 Jun 29 05:00–08:00 Jun 30 05:00–08:00
July
Jul 2 05:00–09:00 Jul 3 14:00–20:00 Jul 4 05:00–09:00 Jul 6 17:00–20:00 Jul 9 05:00–11:00, 16:00–20:00 Jul 10 14:00–19:00 Jul 11 05:00–10:00 Jul 12 05:00–08:00 Jul 13 05:00–10:00 Jul 14 05:00–07:00 Jul 16 05:00–11:00 Jul 18 05:00–10:00, 17:00–21:00 Jul 20 05:00–08:00 Jul 21 18:00–21:00 Jul 23 05:00–11:00 Jul 24 05:00–08:00 Jul 25 05:00–08:00 Jul 27 17:00–21:00 Jul 28 05:00–08:00, 17:00–21:00 Jul 30 05:00–10:00, 17:00–20:00
August
Aug 1 05:00–09:00, 17:00–21:00 Aug 4 05:00–08:00 Aug 6 06:00–11:00, 19:00–20:00 Aug 7 16:00–19:00 Aug 8 05:00–07:00 Aug 10 05:00–07:00, 15:00–17:00 Aug 11 05:00–08:00, 15:00–17:00 Aug 13 05:00–08:00, 19:00–21:00 Aug 15 05:00–09:00 Aug 17 15:00–19:00 Aug 19 18:00–21:00 Aug 20 16:00–19:00 Aug 22 05:00–08:00 Aug 23 05:00–09:00, 13:00–16:00 Aug 24 05:00–07:00, 16:00–21:00 Aug 25 17:00–20:00 Aug 27 05:00–08:00, 17:00–18:00, 21:00–22:00 Aug 28 14:00–18:00 Aug 30 05:00–09:00 Aug 31 05:00–09:00
September
Sep 1 05:00–10:00 Sep 3 05:00–11:00, 17:00–21:00 Sep 4 14:00–17:00 Sep 5 05:00–09:00 Sep 8 05:00–09:00, 19:00–22:00 Sep 9 17:00–19:00 Sep 11 05:00–08:00 Sep 12 05:00–10:00 Sep 13 05:00–08:00 Sep 14 05:00–09:00, 14:00–17:00 Sep 15 21:00–23:00 Sep 17 05:00–11:00 Sep 18 05:00–09:00 Sep 19 05:00–09:00 Sep 20 19:00–22:00 Sep 21 14:00–17:00 Sep 23 12:00–16:00 Sep 24 14:00–19:00 Sep 25 15:00–17:00, 19:00–20:00 Sep 26 05:00–07:00 Sep 27 05:00–09:00 Sep 28 14:00–19:00 Sep 29 18:00–22:00
October
Oct 1 05:00–10:00, 16:00–19:00 Oct 2 14:00–18:00 Oct 3 05:00–09:00 Oct 5 15:00–18:00 Oct 6 05:00–10:00 Oct 8 05:00–10:00, 17:00–21:00 Oct 9 14:00–16:00, 18:00–19:00 Oct 10 05:00–06:00 Oct 12 16:00–21:00 Oct 13 15:00–18:00 Oct 15 05:00–10:00, 17:00–19:00 Oct 16 14:00–17:00 Oct 17 05:00–07:00 Oct 20 15:00–18:00 Oct 22 05:00–10:00, 18:00–20:00 Oct 23 14:00–19:00 Oct 25 05:00–09:00 Oct 26 06:00–10:00, 17:00–22:00 Oct 27 17:00–22:00 Oct 29 06:00–10:00, 19:00–21:00 Oct 30 17:00–23:00
November
Nov 2 17:00–18:00 Nov 3 15:00–19:00 Nov 4 16:00–21:00 Nov 5 15:00–21:00 Nov 7 19:00–22:00 Nov 9 06:00–10:00, 19:00–23:00 Nov 10 17:00–22:00 Nov 12 17:00–22:00 Nov 13 17:00–20:00 Nov 15 06:00–10:00, 17:00–19:00 Nov 16 15:00–19:00 Nov 17 06:00–11:00, 18:00–22:00 Nov 19 14:00–20:00 Nov 20 15:00–22:00 Nov 21 06:00–10:00 Nov 23 14:00–19:00 Nov 24 17:00–23:00 Nov 25 16:00–18:00 Nov 26 18:00–20:00 Nov 27 15:00–19:00 Nov 28 06:00–09:00, 17:00–18:00 Nov 29 06:00–09:00
December
Dec 2 16:00–23:00 Dec 3 17:00–22:00 Dec 4 15:00–18:00 Dec 5 06:00–09:00, 16:00–18:00 Dec 6 06:00–09:00 Dec 8 17:00–19:00 Dec 10 15:00–20:00 Dec 11 18:00–22:00 Dec 13 06:00–09:00, 16:00–19:00 Dec 14 20:00–22:00 Dec 15 17:00–21:00 Dec 17 16:00–23:00 Dec 18 15:00–19:00 Dec 19 16:00–20:00 Dec 21 17:00–22:00 Dec 22 15:00–16:00, 19:00–20:00 Dec 27 09:00–10:00, 15:00–18:00 Dec 28 17:00–21:00 Dec 29 15:00–20:00 Dec 31 06:00–10:00, 16:00–18:00