friend trying to rip me off .......

It really doesn't matter how much time he said it took. Every job has a estimated labor time. Sometimes you can beat the time sometimes you can't. I just rebuilt a 8.5 inch 07 Chevy Traverse rear end. Book calls for 4.6 hrs. I had trouble with my bearing puller and I spent 6 hrs on it. Guess what I charged the customer? 4.6 hrs!