The way I see it, you have two options. You can run the OSC command on a 60 minute cycle (run 2.5 minutes per hour) to start and stop on the hour or you could have it run on a 24 minute cycle. Below are the top options that I would consider...but I think I would go with the 24 minute cycle. Smaller doses, more spread out.
24 minute cycle:
OSC 023:00/001:00/000:00 Then ON
60 minute cycle:
OSC 057:30/002:30/000:00 Then ON
Hope that helps.
--AJ