Hi Dan,
Sorry taken a while to respond to this! I hope the performance talkthrough with @hellocatfood helped a bit towards this. Will talk with @heavy.lifting about how to approach this aspect too, we covered preparing for sets etc in the summerschool we ran in Sheffield last year.
I would say though that preparing a 1h solo live coding set is tricky. I like 30 mins as a sweet spot, 40 mins as a comfortable maximum (with preparation, a good night's sleep etc!). I have done 2 hour+ performances, but generally only in collaboration.. We should set up some networked collaboration as part of this course at some point - it's a great way to get inspiration!