The thing with my tuner, and I'd assume with other tuners, is that it takes about 3-5 minutes to flash each change to the computer. If you're just flashing one thing to the pcm, its faster but flashing the whole system for the actual performance tune when you do everything at once took about 10 minutes. When I calibrated my speedo, it took me 4 flashes and each was about 2 minutes to flash. Found out in testing the speedo with the gps and confirming with several radar signs afterwards that 275/60/20s are 32 inch tall tires in the tuner menu (mid life tread wear) and I could have saved myself a half hour by looking that up lol. But in reality it was nice to calibrate them to my gps for mid life tread wear.


As far as time goes, you could easily spend an afternoon tweaking things if you got super picky and didn't have much clue as to what does what and how it will react.