Most often in July, 27 days.
Highest follower count seen that year: 4,273.
June
Jun 3 06:00–14:00 Jun 4 06:00–10:00, 12:00–14:00 Jun 5 05:00–06:00, 09:00–14:00 Jun 6 07:00–10:00 Jun 7 07:00–13:00 Jun 8 05:00–12:00 Jun 9 05:00–10:00 Jun 10 11:00–15:00, 18:00–20:00 Jun 11 05:00–09:00, 11:00–13:00 Jun 12 11:00–12:00 Jun 13 06:00–09:00, 12:00–13:00 Jun 14 06:00–08:00, 11:00–13:00 Jun 15 06:00–13:00 Jun 18 05:00–06:00, 09:00–14:00 Jun 19 05:00–08:00 Jun 20 07:00–13:00 Jun 21 08:00–13:00 Jun 22 06:00–10:00 Jun 23 06:00–13:00 Jun 24 06:00–08:00, 13:00–17:00 Jun 25 05:00–13:00 Jun 26 07:00–08:00 Jun 27 15:00–16:00 Jun 28 11:00–15:00 Jun 29 06:00–16:00 Jun 30 08:00–12:00
July
Jul 1 06:00–14:00 Jul 2 08:00–09:00, 11:00–13:00 Jul 3 06:00–12:00 Jul 4 05:00–14:00 Jul 5 09:00–14:00 Jul 6 06:00–13:00 Jul 7 06:00–14:00 Jul 8 06:00–09:00, 12:00–14:00 Jul 9 06:00–13:00 Jul 11 06:00–12:00 Jul 12 06:00–13:00 Jul 13 07:00–11:00 Jul 14 10:00–13:00 Jul 15 06:00–12:00 Jul 16 06:00–11:00, 13:00–14:00 Jul 17 07:00–12:00 Jul 19 06:00–13:00 Jul 20 09:00–13:00 Jul 21 07:00–12:00 Jul 23 06:00–15:00 Jul 24 07:00–11:00 Jul 25 06:00–14:00 Jul 26 05:00–14:00 Jul 28 08:00–14:00 Jul 29 07:00–10:00 Jul 30 05:00–07:00, 11:00–13:00 Jul 31 08:00–14:00
August
Aug 1 06:00–11:00 Aug 2 06:00–14:00 Aug 4 06:00–11:00 Aug 5 06:00–13:00 Aug 6 07:00–14:00 Aug 8 06:00–12:00 Aug 10 07:00–14:00 Aug 11 08:00–13:00 Aug 12 07:00–13:00 Aug 13 07:00–12:00 Aug 16 06:00–08:00 Aug 17 07:00–12:00 Aug 18 08:00–10:00, 13:00–14:00 Aug 19 06:00–13:00 Aug 20 06:00–12:00 Aug 21 06:00–10:00 Aug 22 06:00–13:00 Aug 23 07:00–13:00 Aug 24 08:00–09:00, 11:00–12:00 Aug 25 06:00–09:00 Aug 26 06:00–08:00, 10:00–13:00 Aug 27 07:00–10:00, 12:00–13:00 Aug 28 07:00–11:00 Aug 29 07:00–15:00 Aug 30 06:00–09:00, 11:00–12:00 Aug 31 05:00–13:00
September
Sep 1 07:00–12:00 Sep 3 07:00–11:00 Sep 5 06:00–13:00 Sep 6 05:00–09:00 Sep 7 07:00–14:00 Sep 8 05:00–13:00 Sep 9 06:00–08:00, 10:00–12:00 Sep 10 06:00–14:00 Sep 11 06:00–09:00 Sep 12 06:00–13:00 Sep 13 07:00–12:00 Sep 14 06:00–10:00 Sep 15 07:00–12:00 Sep 16 06:00–13:00 Sep 17 08:00–12:00 Sep 18 08:00–11:00 Sep 20 07:00–12:00 Sep 22 08:00–13:00 Sep 23 05:00–11:00 Sep 24 06:00–08:00, 11:00–12:00 Sep 25 06:00–11:00 Sep 26 06:00–13:00 Sep 27 07:00–13:00 Sep 29 08:00–13:00 Sep 30 06:00–14:00
October
Oct 1 06:00–11:00 Oct 2 06:00–15:00 Oct 3 07:00–10:00 Oct 4 06:00–14:00 Oct 5 07:00–12:00, 15:00–16:00 Oct 6 06:00–13:00 Oct 7 07:00–10:00 Oct 8 06:00–11:00 Oct 9 05:00–13:00 Oct 10 08:00–12:00 Oct 11 08:00–10:00 Oct 13 06:00–14:00 Oct 14 05:00–09:00, 11:00–12:00 Oct 15 07:00–08:00 Oct 16 07:00–13:00 Oct 17 09:00–12:00 Oct 18 12:00–16:00 Oct 19 08:00–09:00 Oct 23 16:00–18:00 Oct 24 06:00–13:00 Oct 25 06:00–09:00, 11:00–12:00 Oct 27 06:00–13:00 Oct 28 07:00–13:00 Oct 29 07:00–13:00 Oct 30 11:00–13:00 Oct 31 05:00–13:00
November
Nov 2 07:00–11:00 Nov 3 06:00–10:00, 12:00–13:00 Nov 4 06:00–07:00, 10:00–11:00 Nov 5 06:00–10:00 Nov 6 09:00–12:00 Nov 7 08:00–12:00 Nov 8 07:00–12:00 Nov 9 07:00–14:00 Nov 10 06:00–08:00 Nov 11 07:00–13:00 Nov 12 07:00–13:00 Nov 13 07:00–13:00 Nov 15 11:00–12:00, 16:00–17:00 Nov 16 07:00–08:00 Nov 17 12:00–14:00 Nov 18 07:00–11:00 Nov 19 20:00–24:00 Nov 20 07:00–13:00 Nov 21 07:00–08:00, 10:00–13:00 Nov 22 08:00–13:00 Nov 23 06:00–13:00 Nov 24 06:00–13:00 Nov 26 07:00–09:00 Nov 27 06:00–14:00 Nov 28 06:00–08:00, 10:00–11:00 Nov 29 06:00–13:00 Nov 30 08:00–13:00
December
Dec 1 06:00–08:00, 11:00–13:00 Dec 2 06:00–13:00 Dec 3 07:00–13:00 Dec 4 09:00–14:00 Dec 5 06:00–09:00, 12:00–15:00 Dec 6 08:00–12:00 Dec 7 08:00–14:00 Dec 8 06:00–14:00 Dec 9 07:00–13:00 Dec 10 08:00–12:00 Dec 12 07:00–12:00