Up on a lift wouldn't be bad. Flat on your back in the dirt is a little different. You can get it done either way, though. 3 to 5 hours is just about right.
Either way, allow time for a shower afterwards. Wear glasses or goggles and keep your mouth shut while under the engine. Dirty oil in your eye or mouth is no fun.
No matter how many times you have seen the nitro guys tear down a hot bottom end do not attempt this with a hot engine.
MOST importantly - DO NOT I repeat DO NOT let your wife catch you putting your oil soaked shirt in her new washer. Don't ask me how I know this.
