It looks like the sets could be even shorter than advertised - there is no time allowed for change overs in Chris's list.
Yes, there is - at least 20 minutes between sets. You have noticed that there are
two stages?
Sounds like the same set-up as last year - the two stages are next to each other, so the music is continuous, they change-over on the big stage while the next act is playing on the smaller stage.
The park is so small, you can hear from most places (and certainly from the bar), so you don't really miss out on anything :-)