No, you're wrong. Recording PTAT channels using one tuner (the big 4 networks) is not limited to just prime time hours. Any time of day they can be recorded using only 1 tuner. If you set up timers on the big 4 locals in the morning, all 4 timers will fire, and will only use 1 tuner. It doesn't have to record the networks 24 hours a day.
The same principle could technically be applied to other satellite channels provided that the channels being recorded are all on the same transponder.
The same principle could technically be applied to other satellite channels provided that the channels being recorded are all on the same transponder.