Usually most shows for outdoor start around 8.30pm or so, unless you're at an indoor one, which usually goes from 7.30pm 'til 10pm or so. Or well past midnight if you're lucky. I think the latest one was for me was from 8.30pm - 1.50am, but that was three bands.
U2 went from 8.30 (Jay-Z on about 7pm or so) and to about 11pm. Lucky I was down the road from the venue so it didn't bother me what time, I just walked back through Melbourne to get back to the hotel. Usually I do that if I'm by myself, I walk back from most venues to the city, then catch either a taxi or a bus home.
You have a lot of daylight? I think daylight went 'til about 8.50 tonight - ha, I'd had a great two days previously. Asked my friend if she wanted to catch up, which we did and so I went back to her place and we finished off there, then went back and had some more fun down at the river.
I just received Crazy Tonight on 7" vinyl and it was NEW and SEALED. Cost me just over £2 and I ordered it at 6pm last night on Amazon. Take that Royal Mail!