That's like askng how long a kite string is. Lots of variables, depends on how much time the tuner actually spent going through each gear through the rpm range and tuning front and rear cylinder. Vs loading a close map on file and doing a few pulls and calling it good. I'm not a tuner and don't know how to tune, but it seems hard to find good ones that spend the time to dial it in specific for your bike.
I think if you are paying the money the bike should be running at the top of its game, not lean in spots, smelling like fuel out the exhaust, soot building in pipe or popping. Maybe what I ask for is too much. 20 miles seems low. Did you check your odometer when you dropped it off and picked it up?
I always log my mileage when I drop my bike off for work.