I do Glenrothes to Peterhead and start at 02:30, usualy get back about 11am, I try to get out of Aberdeen on the way back for 7am to beat the traffic as an artic in Aberdeen in peak time is no fun at all.
A Sat morn would probably be best as im passing the inverbervie chippy on the A90 between 09:00 and 10:00 but Im in no hurry and can work round you.
Do you have paypal? so I can get the beer tokens to you quicker.
Cheers.
Drew.