Most often in April, 23 days.
Highest follower count seen that year: 6,667.
January
Jan 4 11:00–24:00 Jan 5 00:00–07:00, 10:00–15:00 Jan 7 11:00–24:00 Jan 8 01:00–12:00 Jan 10 17:00–18:00, 20:00–24:00 Jan 11 00:00–06:00, 09:00–16:00 Jan 13 13:00–24:00 Jan 14 00:00–06:00, 10:00–15:00, 19:00–21:00 Jan 16 09:00–10:00, 15:00–24:00 Jan 17 00:00–06:00, 10:00–16:00 Jan 19 15:00–19:00, 21:00–24:00 Jan 20 03:00–07:00, 10:00–17:00, 19:00–24:00 Jan 22 17:00–22:00 Jan 23 01:00–03:00, 09:00–14:00, 17:00–19:00, 21:00–24:00 Jan 24 01:00–05:00, 10:00–14:00, 16:00–18:00, 22:00–24:00 Jan 25 00:00–01:00, 06:00–14:00 Jan 28 18:00–24:00 Jan 29 00:00–01:00, 11:00–14:00, 18:00–20:00 Jan 31 11:00–16:00, 18:00–24:00
February
Feb 1 08:00–10:00, 12:00–16:00 Feb 4 15:00–24:00 Feb 5 00:00–05:00, 12:00–17:00 Feb 7 10:00–15:00, 19:00–23:00 Feb 8 04:00–06:00, 09:00–14:00 Feb 11 15:00–16:00, 18:00–20:00 Feb 12 00:00–05:00, 11:00–13:00, 19:00–23:00 Feb 13 03:00–04:00, 10:00–16:00 Feb 14 18:00–24:00 Feb 15 00:00–03:00, 10:00–14:00 Feb 18 14:00–17:00, 20:00–24:00 Feb 19 00:00–01:00, 03:00–06:00, 09:00–15:00 Feb 21 10:00–17:00, 19:00–21:00 Feb 22 00:00–03:00, 10:00–15:00 Feb 25 15:00–17:00, 19:00–24:00 Feb 26 00:00–06:00, 11:00–13:00 Feb 28 17:00–24:00
March
Mar 1 00:00–01:00, 03:00–07:00, 10:00–16:00 Mar 4 16:00–17:00, 19:00–22:00 Mar 5 09:00–12:00, 14:00–17:00 Mar 7 06:00–08:00, 22:00–24:00 Mar 8 00:00–05:00, 07:00–11:00 Mar 11 17:00–20:00, 22:00–24:00 Mar 12 00:00–03:00, 09:00–13:00, 15:00–16:00 Mar 13 18:00–21:00, 23:00–24:00 Mar 14 14:00–17:00, 23:00–24:00 Mar 15 00:00–04:00, 12:00–16:00 Mar 18 19:00–21:00, 23:00–24:00 Mar 19 00:00–03:00, 11:00–16:00 Mar 20 19:00–24:00 Mar 21 00:00–04:00, 14:00–17:00, 21:00–24:00 Mar 22 00:00–05:00, 12:00–16:00 Mar 24 18:00–22:00 Mar 25 01:00–07:00, 14:00–24:00 Mar 26 01:00–05:00 Mar 29 16:00–23:00 Mar 30 01:00–03:00
April
Apr 1 19:00–24:00 Apr 2 03:00–10:00 Apr 4 06:00–12:00, 21:00–24:00 Apr 5 00:00–04:00 Apr 6 17:00–21:00 Apr 7 02:00–04:00 Apr 8 18:00–20:00, 22:00–23:00 Apr 9 00:00–03:00, 08:00–12:00 Apr 11 09:00–15:00, 18:00–24:00 Apr 12 02:00–05:00, 09:00–12:00 Apr 14 18:00–24:00 Apr 15 00:00–04:00 Apr 17 22:00–24:00 Apr 18 00:00–02:00, 08:00–13:00, 18:00–24:00 Apr 19 00:00–04:00, 06:00–08:00, 10:00–15:00 Apr 22 20:00–24:00 Apr 23 00:00–01:00, 03:00–05:00, 11:00–17:00 Apr 24 22:00–24:00 Apr 25 00:00–03:00, 19:00–24:00 Apr 26 00:00–02:00, 12:00–16:00 Apr 28 20:00–24:00 Apr 29 05:00–08:00, 15:00–18:00, 22:00–24:00 Apr 30 00:00–06:00
May
May 6 19:00–24:00 May 7 00:00–01:00, 07:00–12:00, 14:00–15:00 May 9 03:00–09:00, 12:00–13:00, 16:00–18:00, 21:00–24:00 May 10 00:00–04:00, 09:00–17:00 May 13 04:00–13:00, 18:00–21:00, 23:00–24:00 May 14 00:00–01:00, 11:00–16:00, 19:00–20:00 May 15 07:00–11:00, 13:00–14:00, 17:00–18:00 May 17 15:00–16:00, 18:00–24:00 May 18 01:00–04:00, 18:00–24:00 May 19 20:00–23:00 May 20 20:00–22:00 May 21 01:00–04:00, 07:00–10:00 May 22 18:00–24:00 May 23 00:00–02:00, 09:00–12:00, 15:00–16:00, 22:00–24:00 May 24 00:00–02:00 May 25 14:00–16:00 May 29 18:00–24:00 May 30 00:00–02:00, 13:00–16:00 May 31 03:00–09:00, 13:00–16:00
June
Jun 5 12:00–15:00, 22:00–24:00 Jun 6 00:00–01:00 Jun 10 22:00–24:00 Jun 11 22:00–24:00 Jun 12 00:00–02:00, 19:00–24:00 Jun 13 00:00–03:00 Jun 16 05:00–13:00 Jun 18 19:00–24:00 Jun 19 18:00–24:00 Jun 20 00:00–02:00, 21:00–24:00 Jun 21 00:00–02:00, 21:00–24:00 Jun 22 18:00–20:00 Jun 23 05:00–07:00, 12:00–13:00 Jun 24 20:00–21:00 Jun 25 00:00–01:00, 09:00–14:00, 19:00–21:00 Jun 26 19:00–24:00 Jun 27 00:00–03:00, 20:00–24:00 Jun 28 00:00–01:00 Jun 29 11:00–17:00 Jun 30 02:00–05:00, 14:00–17:00
July
Jul 1 07:00–11:00, 17:00–22:00 Jul 2 03:00–07:00, 12:00–15:00 Jul 3 21:00–24:00 Jul 4 00:00–01:00, 15:00–24:00 Jul 5 00:00–02:00, 19:00–23:00 Jul 7 03:00–07:00, 11:00–12:00 Jul 8 04:00–08:00, 13:00–18:00 Jul 9 04:00–08:00 Jul 10 04:00–07:00 Jul 11 04:00–09:00, 17:00–22:00 Jul 12 11:00–15:00 Jul 13 04:00–09:00 Jul 14 04:00–07:00, 12:00–16:00 Jul 15 05:00–06:00, 08:00–09:00, 19:00–21:00 Jul 16 10:00–14:00 Jul 18 19:00–24:00 Jul 19 00:00–04:00 Jul 20 22:00–24:00 Jul 21 00:00–03:00 Jul 22 04:00–08:00 Jul 23 05:00–08:00, 11:00–17:00 Jul 24 05:00–07:00, 21:00–24:00 Jul 25 00:00–02:00