I’m not sure. Consistency on radio is pretty important, plus Scott Mills does TV work at the weekends so even if it’s 8 weeks holiday that time is getting made up elsewhere I’d imagine.
That’s three hours live, too, which is taxing in itself, so typically you have prep work of a few hours going through script and playlists and the 3 hours intense work daily, actually doing the show, so it is earned in terms of effort.
Any actor on the other hand will tell you the brunt of their job is waiting around and that’s the tiring part. It’s long shoot hours but you could be on your phone playing candy crush for most of the time you are actually on the clock.