Most often in May, 24 days.
Highest follower count seen that year: 3,006.
April
Apr 24 21:00–24:00 Apr 25 00:00–01:00, 18:00–24:00 Apr 26 00:00–01:00, 21:00–24:00 Apr 27 00:00–03:00 Apr 28 21:00–24:00 Apr 29 00:00–04:00, 20:00–24:00 Apr 30 00:00–02:00, 20:00–24:00
May
May 1 00:00–02:00 May 2 20:00–24:00 May 3 00:00–03:00, 20:00–23:00 May 4 20:00–23:00 May 7 20:00–24:00 May 8 00:00–02:00, 20:00–24:00 May 9 00:00–02:00, 20:00–24:00 May 10 00:00–03:00, 20:00–24:00 May 11 00:00–02:00, 20:00–24:00 May 12 00:00–02:00 May 14 18:00–24:00 May 15 00:00–01:00, 20:00–24:00 May 16 00:00–01:00, 19:00–24:00 May 17 00:00–01:00, 19:00–24:00 May 18 00:00–01:00, 18:00–24:00 May 21 18:00–24:00 May 22 18:00–24:00 May 23 18:00–24:00 May 26 18:00–24:00 May 27 18:00–24:00 May 28 00:00–01:00, 18:00–24:00 May 29 00:00–01:00, 18:00–24:00 May 30 00:00–01:00 May 31 02:00–09:00
June
Jun 1 02:00–09:00 Jun 4 02:00–09:00 Jun 5 02:00–08:00 Jun 6 02:00–09:00 Jun 7 02:00–03:00 Jun 10 02:00–09:00 Jun 11 03:00–09:00 Jun 12 02:00–09:00 Jun 14 04:00–08:00 Jun 15 02:00–08:00 Jun 18 02:00–09:00 Jun 19 04:00–08:00 Jun 21 05:00–11:00 Jun 22 05:00–11:00 Jun 23 05:00–12:00 Jun 24 09:00–10:00 Jun 25 04:00–10:00 Jun 26 16:00–22:00 Jun 27 16:00–18:00 Jun 28 16:00–22:00 Jun 29 16:00–22:00 Jun 30 15:00–22:00
July
Jul 3 16:00–22:00 Jul 5 03:00–09:00 Jul 6 04:00–07:00 Jul 7 04:00–09:00 Jul 8 03:00–10:00 Jul 10 02:00–04:00 Jul 11 03:00–10:00 Jul 12 04:00–10:00 Jul 14 04:00–05:00, 14:00–18:00 Jul 16 03:00–08:00 Jul 18 04:00–10:00 Jul 19 03:00–09:00 Jul 21 04:00–10:00 Jul 22 10:00–14:00 Jul 23 06:00–11:00 Jul 24 03:00–07:00, 15:00–18:00 Jul 28 04:00–09:00 Jul 29 03:00–07:00, 14:00–17:00 Jul 30 11:00–17:00 Jul 31 04:00–07:00, 15:00–18:00
August
Aug 4 10:00–16:00 Aug 5 06:00–07:00 Aug 6 08:00–09:00, 16:00–18:00 Aug 7 09:00–16:00 Aug 8 03:00–04:00, 17:00–21:00 Aug 12 03:00–10:00 Aug 13 08:00–14:00 Aug 14 13:00–18:00 Aug 15 04:00–09:00, 17:00–20:00 Aug 18 03:00–08:00, 15:00–18:00 Aug 19 03:00–06:00, 16:00–19:00 Aug 20 04:00–09:00 Aug 21 11:00–17:00 Aug 22 04:00–11:00 Aug 25 12:00–19:00 Aug 26 08:00–14:00 Aug 27 04:00–08:00, 16:00–18:00 Aug 29 05:00–09:00, 15:00–19:00 Aug 30 16:00–19:00 Aug 31 15:00–18:00
September
Sep 5 15:00–17:00 Sep 9 15:00–17:00 Sep 12 06:00–10:00, 16:00–18:00 Sep 14 05:00–08:00, 16:00–18:00 Sep 15 03:00–07:00, 15:00–17:00 Sep 18 07:00–10:00, 15:00–18:00 Sep 19 04:00–08:00, 15:00–18:00 Sep 20 05:00–08:00, 15:00–17:00 Sep 21 15:00–16:00 Sep 22 13:00–18:00 Sep 23 04:00–08:00, 16:00–18:00 Sep 24 05:00–07:00, 15:00–19:00 Sep 25 12:00–18:00 Sep 26 05:00–08:00, 18:00–20:00 Sep 28 08:00–10:00, 15:00–19:00 Sep 29 05:00–08:00, 15:00–18:00 Sep 30 13:00–17:00
October
Oct 1 15:00–18:00 Oct 2 04:00–07:00, 17:00–19:00 Oct 3 05:00–08:00, 15:00–19:00 Oct 6 15:00–19:00 Oct 8 03:00–06:00, 16:00–19:00 Oct 9 04:00–08:00 Oct 10 05:00–07:00, 15:00–18:00 Oct 13 04:00–08:00, 16:00–17:00 Oct 14 05:00–08:00, 16:00–17:00 Oct 15 05:00–09:00, 15:00–18:00 Oct 17 05:00–08:00, 15:00–17:00 Oct 19 15:00–18:00 Oct 20 13:00–17:00 Oct 21 06:00–10:00, 15:00–17:00 Oct 22 05:00–08:00, 17:00–24:00 Oct 23 00:00–06:00 Oct 24 05:00–08:00, 15:00–19:00 Oct 27 03:00–07:00, 16:00–19:00 Oct 29 05:00–08:00, 16:00–18:00 Oct 30 15:00–18:00 Oct 31 06:00–08:00, 16:00–20:00
November
Nov 3 05:00–07:00 Nov 4 03:00–07:00, 15:00–19:00 Nov 5 04:00–07:00, 14:00–18:00 Nov 6 04:00–08:00, 17:00–19:00 Nov 7 03:00–05:00, 16:00–19:00 Nov 10 04:00–07:00, 14:00–17:00 Nov 11 04:00–09:00 Nov 12 04:00–06:00, 16:00–19:00 Nov 13 04:00–08:00, 15:00–19:00 Nov 14 04:00–08:00, 15:00–19:00 Nov 15 05:00–09:00, 15:00–19:00 Nov 18 04:00–11:00 Nov 19 04:00–07:00, 15:00–19:00 Nov 20 05:00–11:00, 16:00–19:00 Nov 24 05:00–08:00, 16:00–18:00 Nov 26 04:00–07:00, 16:00–19:00 Nov 27 14:00–19:00 Nov 28 05:00–08:00, 17:00–20:00 Nov 30 04:00–07:00
December
Dec 1 14:00–16:00 Dec 2 04:00–07:00, 15:00–18:00 Dec 3 05:00–10:00, 16:00–17:00 Dec 4 04:00–05:00 Dec 5 04:00–08:00, 16:00–18:00 Dec 8 04:00–07:00, 11:00–13:00 Dec 11 05:00–11:00 Dec 12 01:00–06:00 Dec 14 14:00–19:00 Dec 15 13:00–17:00 Dec 16 01:00–08:00 Dec 17 02:00–06:00, 15:00–18:00 Dec 19 02:00–06:00, 16:00–18:00 Dec 22 02:00–08:00 Dec 24 02:00–06:00, 16:00–17:00 Dec 26 02:00–05:00, 15:00–19:00 Dec 29 02:00–05:00, 15:00–17:00 Dec 30 02:00–08:00 Dec 31 03:00–08:00