this last time i did the head was really my first time doing the head while it was in the car, and i split it up into 2 days. i was just too lazy to do it all in one day, but i think altogether i spent 6 hours on it. i spent more redoing the timing belt because it was off a bit. i didnt notice the part in the haynes manual that said the exhaust cam tends to rotate a tooth counterclockwise when the timing belt it tensioned.