The install time start to finish (which I can now do in my sleep haha) is about 1.5hrs taking your time and punching in FORScan values after install. Maybe tack on another 0.5-1hr for the wiring harness modifications and checking your pins/wires. Realistically if you were to start with the guide at the beginning of a Saturday, you'd be done by dinner, going at a leisurely pace. Well worth it in my opinion, it feels so much more useful and snappier overall.I absolutely love my 12”. Best mod by far. Great write up. How many combined hours did this take?