Our normal Saturday club run starts at 7am. A few of the more keen types do an early lap around 5:30. Sunday rides start at a more sociable hour between 8 and 9. Bank holiday rides tend to start at various times of the time (sometimes one ride will go out, sometimes there will be several).
I don't mind the 7am start as I'm not much of a sleeper anyway. It means I'm home around 10am if I don't extend my ride, and get the rest of the day with my wife. She prefers my cycling to my diving as I'm not gone all day.