3-4 minutes tops. Did you buy it new? Canned tunes or custom? Have you talked to who you got it from?
Good point on the stock tune writing to memory. Still sounds like something is wrong with the device, or it's written for the wrong PCM code.For the Diablosport I would say 5 minutes or less. Working at an automotive aftermarket company as a product copywriter, I am 100% positive that all name brand tuners take less than 5 minutes to load a tune. However, if it is your first time loading a tune you have to factor in the time the tuner takes to write your stock program to its memory and then the additional time it takes to load the new tune. It still should be less than 10 minutes for that entire process.