4? That's also my suspicion.
Two are at random time.
And the other two are exactly those random two plus 12 hours.
Below a list of previous allpower times.
04/16/12 at 02:28 p.m. EDT (20:28 CEST)
04/17/12 at 01:09 p.m. EDT (19:09 CEST)
04/18/12 at 04:04 a.m. EDT (10:04 CEST)
04/19/12 at 05:04 a.m. EDT (11:04 CEST)
04/20/12 at 06:07 a.m. EDT (12:07 CEST)
04/21/12 at 07:46 a.m. EDT (13:46 CEST)
04/22/12 at 06:24 a.m. EDT (12:24 CEST)
04/23/12 at 04:41 a.m. EDT (10:41 CEST)
04/24/12 at 09:30 a.m. EDT (15:30 CEST)
04/25/12 at 01:28 p.m. EDT (19:28 CEST)
04/26/12 at 04:09 a.m. EDT (10:09 CEST)
04/27/12 at 05:49 a.m. EDT (11:49 CEST)
Looks semi random to me.
True colours always shine brighter within darkness. ~ WonderDrow ~