Ideally it would be about 7am, but my DH moans if I wake him up early and if I get up then the DDs wake up, and by the time I've sorted them out it's 8am and I get caught up in the school run. So usually I go about 9am which is OK most of the time, but not in this hot weather.
I have been in the evening a couple of times which is nice, but my DDs don't always go to bed at a decent time.