Most often in March, 27 days.
Highest follower count seen that year: 7,678.
January
Jan 6 06:00–07:00, 11:00–15:00 Jan 7 05:00–06:00, 08:00–09:00, 14:00–15:00, 18:00–19:00 Jan 8 03:00–05:00, 09:00–12:00, 14:00–17:00 Jan 9 06:00–08:00, 11:00–14:00 Jan 10 03:00–05:00, 07:00–08:00, 11:00–12:00, 14:00–15:00, 17:00–18:00 Jan 11 04:00–10:00, 17:00–19:00 Jan 12 04:00–08:00, 15:00–16:00 Jan 21 05:00–08:00, 14:00–17:00 Jan 22 05:00–07:00, 13:00–15:00, 17:00–18:00 Jan 23 03:00–07:00, 13:00–15:00, 17:00–19:00 Jan 24 03:00–09:00, 14:00–19:00 Jan 25 03:00–07:00, 11:00–16:00 Jan 26 07:00–10:00 Jan 30 04:00–07:00, 09:00–10:00, 13:00–18:00 Jan 31 08:00–12:00, 14:00–15:00
February
Feb 1 14:00–15:00 Feb 2 07:00–10:00 Feb 3 14:00–20:00 Feb 4 05:00–07:00, 11:00–15:00, 17:00–19:00 Feb 5 03:00–07:00, 09:00–10:00, 13:00–15:00, 17:00–19:00 Feb 7 04:00–05:00, 15:00–17:00 Feb 8 08:00–12:00, 14:00–16:00 Feb 9 04:00–05:00, 10:00–11:00, 15:00–16:00 Feb 10 04:00–05:00, 13:00–14:00 Feb 11 05:00–06:00 Feb 12 13:00–15:00 Feb 15 14:00–15:00, 17:00–19:00 Feb 16 05:00–11:00, 13:00–16:00 Feb 17 06:00–08:00, 10:00–11:00, 14:00–15:00 Feb 18 12:00–15:00 Feb 19 03:00–04:00, 07:00–08:00, 14:00–16:00 Feb 20 05:00–06:00, 09:00–10:00, 14:00–18:00 Feb 21 04:00–06:00, 09:00–10:00, 14:00–15:00, 17:00–19:00 Feb 22 09:00–11:00, 14:00–15:00, 17:00–19:00 Feb 23 02:00–07:00, 15:00–17:00 Feb 24 04:00–05:00, 13:00–16:00 Feb 25 06:00–07:00 Feb 26 13:00–15:00 Feb 27 07:00–08:00, 14:00–20:00 Feb 28 05:00–07:00, 13:00–16:00
March
Mar 1 06:00–08:00, 13:00–15:00 Mar 4 13:00–15:00 Mar 5 13:00–14:00 Mar 6 05:00–09:00, 12:00–15:00 Mar 7 04:00–06:00, 12:00–18:00 Mar 8 02:00–07:00, 09:00–11:00, 13:00–17:00, 19:00–21:00 Mar 9 02:00–06:00 Mar 11 07:00–09:00, 11:00–15:00 Mar 12 04:00–08:00, 13:00–16:00 Mar 13 04:00–05:00, 08:00–10:00, 14:00–18:00 Mar 14 13:00–14:00 Mar 15 11:00–15:00 Mar 16 02:00–06:00, 09:00–10:00 Mar 17 13:00–14:00 Mar 18 04:00–11:00, 14:00–16:00 Mar 19 03:00–07:00, 15:00–17:00 Mar 20 04:00–09:00, 11:00–16:00 Mar 21 02:00–05:00, 09:00–10:00, 13:00–15:00 Mar 22 05:00–06:00 Mar 23 04:00–07:00, 10:00–12:00, 15:00–16:00 Mar 24 16:00–17:00 Mar 26 11:00–12:00, 14:00–15:00 Mar 27 04:00–06:00, 13:00–17:00 Mar 28 04:00–07:00, 13:00–16:00 Mar 29 05:00–08:00, 13:00–16:00 Mar 30 06:00–07:00, 13:00–16:00 Mar 31 04:00–07:00
April
Apr 1 05:00–09:00, 13:00–16:00 Apr 2 03:00–08:00, 10:00–11:00, 13:00–16:00 Apr 3 08:00–09:00, 13:00–18:00 Apr 4 02:00–07:00, 09:00–17:00 Apr 5 04:00–09:00 Apr 10 04:00–06:00, 11:00–15:00 Apr 11 02:00–05:00, 13:00–17:00 Apr 12 05:00–08:00, 11:00–16:00 Apr 13 05:00–07:00, 12:00–14:00 Apr 14 05:00–07:00, 12:00–15:00 Apr 15 04:00–07:00, 11:00–17:00 Apr 16 04:00–09:00, 12:00–17:00 Apr 17 04:00–08:00, 15:00–17:00 Apr 18 05:00–07:00, 09:00–10:00 Apr 19 01:00–03:00, 08:00–09:00, 13:00–14:00 Apr 22 13:00–16:00 Apr 23 03:00–09:00, 13:00–16:00 Apr 24 01:00–03:00, 06:00–07:00, 11:00–12:00, 15:00–18:00 Apr 25 04:00–05:00, 07:00–08:00, 13:00–15:00 Apr 26 04:00–05:00, 08:00–15:00 Apr 27 05:00–10:00, 13:00–16:00 Apr 28 07:00–11:00 Apr 29 05:00–09:00, 12:00–17:00
May
May 3 05:00–06:00, 08:00–16:00 May 6 04:00–07:00, 14:00–16:00 May 7 05:00–08:00, 12:00–14:00 May 8 05:00–07:00, 09:00–10:00, 12:00–18:00 May 9 05:00–07:00, 09:00–11:00, 14:00–15:00 May 10 12:00–16:00 May 11 06:00–07:00, 17:00–19:00 May 12 11:00–14:00 May 13 06:00–08:00, 12:00–18:00 May 14 05:00–07:00, 10:00–15:00 May 15 09:00–16:00 May 16 05:00–11:00, 13:00–17:00 May 17 05:00–07:00, 10:00–14:00 May 18 05:00–07:00 May 19 07:00–08:00, 12:00–13:00 May 20 05:00–08:00, 13:00–15:00 May 21 06:00–07:00, 09:00–11:00, 13:00–15:00 May 22 05:00–08:00, 13:00–15:00 May 23 06:00–07:00, 14:00–17:00 May 24 05:00–08:00, 10:00–16:00 May 27 14:00–15:00 May 28 12:00–16:00 May 29 06:00–08:00, 10:00–20:00 May 30 04:00–07:00, 12:00–19:00 May 31 04:00–09:00, 12:00–17:00
June
Jun 2 05:00–07:00, 12:00–15:00 Jun 3 04:00–08:00, 15:00–17:00 Jun 4 04:00–07:00, 14:00–18:00 Jun 5 04:00–06:00, 09:00–11:00, 13:00–15:00, 17:00–18:00 Jun 6 05:00–06:00, 13:00–14:00 Jun 7 15:00–17:00 Jun 8 05:00–06:00 Jun 10 11:00–13:00, 17:00–18:00 Jun 11 07:00–08:00, 14:00–15:00 Jun 12 06:00–07:00, 09:00–11:00 Jun 13 15:00–16:00 Jun 14 03:00–04:00, 08:00–10:00, 14:00–16:00 Jun 16 07:00–08:00, 10:00–11:00 Jun 17 14:00–16:00 Jun 18 04:00–06:00, 17:00–18:00 Jun 19 05:00–06:00, 18:00–19:00 Jun 20 06:00–07:00, 14:00–18:00 Jun 21 03:00–14:00 Jun 22 04:00–05:00 Jun 24 15:00–16:00 Jun 25 14:00–15:00 Jun 26 07:00–09:00, 14:00–16:00 Jun 27 06:00–07:00, 13:00–16:00 Jun 28 05:00–06:00, 12:00–13:00 Jun 30 04:00–05:00
July
Jul 1 11:00–16:00 Jul 2 02:00–03:00, 14:00–15:00 Jul 3 04:00–06:00 Jul 4 12:00–16:00 Jul 5 05:00–06:00, 08:00–10:00, 12:00–15:00 Jul 6 13:00–18:00 Jul 7 06:00–07:00, 12:00–15:00, 17:00–18:00 Jul 8 06:00–12:00, 14:00–19:00 Jul 9 06:00–07:00, 15:00–19:00 Jul 10 06:00–08:00, 12:00–14:00, 17:00–18:00 Jul 11 05:00–10:00, 12:00–15:00, 17:00–19:00 Jul 12 06:00–08:00, 13:00–20:00 Jul 13 06:00–07:00, 13:00–15:00 Jul 14 13:00–19:00 Jul 15 05:00–08:00, 10:00–12:00, 15:00–16:00, 18:00–19:00 Jul 16 13:00–18:00 Jul 17 06:00–07:00, 09:00–10:00, 12:00–18:00 Jul 18 04:00–05:00, 08:00–09:00, 14:00–15:00, 17:00–19:00 Jul 19 04:00–07:00, 14:00–16:00 Jul 24 16:00–17:00 Jul 26 06:00–08:00, 13:00–19:00 Jul 27 05:00–07:00 Jul 28 14:00–15:00, 17:00–18:00 Jul 29 06:00–07:00, 13:00–14:00 Jul 30 05:00–08:00, 14:00–16:00 Jul 31 05:00–07:00, 14:00–18:00
August
Aug 1 08:00–09:00, 13:00–18:00 Aug 2 05:00–07:00, 09:00–11:00, 13:00–15:00 Aug 6 06:00–10:00 Aug 7 14:00–16:00 Aug 8 05:00–08:00 Aug 9 05:00–06:00 Aug 10 07:00–15:00, 17:00–18:00 Aug 11 12:00–15:00 Aug 12 05:00–06:00, 13:00–15:00 Aug 13 03:00–04:00, 06:00–08:00, 10:00–11:00, 13:00–14:00, 16:00–17:00 Aug 14 03:00–08:00, 13:00–16:00 Aug 15 05:00–08:00, 11:00–15:00, 17:00–18:00 Aug 16 03:00–06:00 Aug 18 12:00–16:00 Aug 19 12:00–17:00 Aug 20 05:00–06:00, 13:00–15:00 Aug 21 03:00–09:00, 16:00–18:00 Aug 22 04:00–08:00, 13:00–17:00 Aug 23 03:00–06:00 Aug 25 14:00–15:00 Aug 26 04:00–05:00, 12:00–15:00 Aug 27 06:00–07:00, 13:00–15:00 Aug 28 04:00–06:00, 12:00–18:00 Aug 29 04:00–06:00, 13:00–14:00, 17:00–18:00 Aug 30 14:00–15:00, 17:00–18:00 Aug 31 02:00–03:00, 05:00–06:00, 13:00–15:00
September
Sep 1 14:00–15:00, 17:00–18:00 Sep 2 05:00–06:00, 13:00–17:00 Sep 3 02:00–03:00, 05:00–06:00, 12:00–13:00, 17:00–18:00 Sep 4 05:00–09:00, 14:00–18:00 Sep 5 02:00–06:00, 12:00–16:00 Sep 6 01:00–05:00, 10:00–11:00, 13:00–14:00 Sep 10 14:00–15:00 Sep 11 10:00–18:00 Sep 12 04:00–05:00, 12:00–14:00, 16:00–18:00 Sep 13 05:00–08:00, 13:00–15:00, 17:00–18:00 Sep 14 01:00–02:00, 06:00–07:00, 13:00–16:00 Sep 18 15:00–17:00 Sep 19 05:00–07:00, 12:00–16:00 Sep 20 06:00–07:00 Sep 21 10:00–11:00 Sep 22 05:00–06:00, 13:00–15:00 Sep 23 02:00–06:00, 13:00–15:00 Sep 24 00:00–01:00, 06:00–07:00, 13:00–14:00 Sep 25 05:00–06:00 Sep 30 03:00–04:00, 12:00–21:00
October
Oct 1 04:00–07:00, 14:00–17:00 Oct 11 14:00–15:00 Oct 12 13:00–16:00 Oct 13 05:00–06:00, 13:00–15:00 Oct 14 04:00–05:00 Oct 15 13:00–16:00 Oct 16 03:00–05:00, 12:00–15:00, 17:00–18:00 Oct 17 04:00–06:00, 16:00–17:00 Oct 18 04:00–05:00 Oct 27 12:00–15:00 Oct 28 14:00–16:00 Oct 29 02:00–03:00, 14:00–16:00 Oct 30 04:00–07:00, 14:00–16:00 Oct 31 04:00–05:00
November
Nov 1 03:00–06:00, 13:00–14:00 Nov 7 05:00–07:00, 12:00–13:00, 15:00–16:00 Nov 8 13:00–14:00 Nov 9 12:00–14:00, 17:00–18:00 Nov 10 05:00–07:00, 14:00–15:00 Nov 11 05:00–06:00, 09:00–10:00, 16:00–17:00 Nov 12 15:00–17:00 Nov 15 15:00–16:00 Nov 17 05:00–06:00 Nov 20 16:00–17:00 Nov 22 15:00–16:00 Nov 28 13:00–16:00 Nov 29 15:00–17:00 Nov 30 10:00–11:00, 14:00–17:00
December
Dec 1 06:00–07:00, 14:00–16:00 Dec 6 05:00–08:00, 13:00–17:00 Dec 11 16:00–17:00 Dec 12 02:00–04:00, 11:00–13:00 Dec 14 13:00–15:00 Dec 15 05:00–06:00, 13:00–17:00 Dec 17 14:00–17:00 Dec 18 02:00–03:00, 05:00–06:00 Dec 19 03:00–05:00, 07:00–08:00, 15:00–16:00 Dec 20 04:00–05:00, 15:00–17:00 Dec 21 03:00–04:00, 09:00–10:00 Dec 22 03:00–06:00, 17:00–18:00 Dec 23 02:00–07:00 Dec 28 04:00–06:00, 14:00–16:00 Dec 29 05:00–06:00, 15:00–17:00 Dec 30 04:00–05:00