The fastest way is to call the workshop for an appointment saying that you want to spray your whole car. Then send it in the morning and most probably about 2-3 working days. For example, send in on Monday, collect on Wednesday or Thursday. Don't send it on Thursday or Friday, otherwise, no car for you over the weekends.
Turtle
I would advise u to leave it for at least a week. For those 2 to 3 days types, it's usually using fast drying paint. Right after spraying it looks fine, but after a few months the effect shows..