Well I got busier than I ever thought and I have had to create a waiting list for customer cars. I try to balance my work between long term projects and short-term turn around. Due to the type of cars I work on, you really need more than one car in the shop, as you are frequently waiting on parts or other services, but I was getting too many and at its worst I had 14 cars in the shop awaiting service. Therefore, I am limiting the number of cars that I will keep at the shop. Optimally I will have 3 to 4 cars, but I will occasionally bring in a 5th car from a returning customer with normal quick service routines.
The wait to get a car in the shop for small stuff is usually a couple of weeks, for bigger projects it is months. I wish I was faster but I do what I can and try and still keep the quality up.