They will air every episode from seasons 1 and 2. Because the pilot is an extended episode, there will be some off the clock times starting out, but I don't think it is so they can add more commercials. The pilot airs from 10PM-11:20PM and episode 2 airs maybe commercial free from 11:20PM-12:07AM. Episode 3 starts at 12:07AM, and throughout the night they gradually get it back to starting on the hour. The marathon goes through 5AM on the morning of April 10 (Friday). This is not the usual Hallmark Movies and Mysteries network Psych is syndicated on, but USA is of course the network it originally aired new episodes for the whole series.