Hi Phil, 1st of all I despise working on the weekend, so I very rarely would work on either sat or sun, and if I was forced to, then I'd work only in the afternoons.
Through the week though, I'll start on domestics at 7.30am, although when I was Trad I'd only start at 8.00am, and the latest I'd work is about 3.30pm.
On commercial I'd start as early as 7.00am and finish no later than 3.30pm.
What I've heard about working on a saturday is that your customer's neighbors will see you and you will pick up many more customers.
Tim