some shops will want to keep your car all day so they can be really anal about waiting a half hour between runs. It should take at least 3-4 runs to get everything dialed in so you're looking at 2 hours of cool-down time plus run-up, run and eval of the results. I've tuned a few mustangs myself (on the dyno...with diablosport revolutions software. Yuk) and while it sounds simple you have to make a series of decisions based on little to no info, so there's some trial and error. The upshot is that there are some things that typically work the same from car to car so you save a little time there.
There is no tuner I've ever heard of that uses a single handheld device to tune multiple cars. If you have a tune you either have a chip in the ECU or a handheld locked to the car, or you sent your ECU in for reflashing and your stock tune no longer exists in any convenient place.
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