It depends where you live and your neighbours, and how long it takes.
Our youngest neighbour is late 50s, eldest early 90s. Large gardens and well spaced houses. I don't think anyone sleeps in, in the mornings.
Lawns take 1.5 to 2 hours (1/2 acre). I think 8/8.30 would be fine. Nobody ever does it on a Sunday - never heard a mower on a Sunday.
In our last house, London, Semi, houses v close together, lots of families, after 9am but it took 20/25 mins.