Took a week for mine. As long as you have correct fitting parts and know exactly what you want thewn there is no problem.
People who constantly change there mind, get the wrong gear and run out of money will see their cars there for long periods as you would any place. Most other places would probably have yours towed away if you ran out of funds.
I have one gripe though, had my mates in for a repair all phone organised for afternoon, only to turn up to a closed workshop. So i took it to Cowley, he just lost some business because his head isn't screwed on properly sometimes.