It already takes me almost two hours to get home as it is!
For a laugh I thought I'd get Strava's route planner to suggest my best route home by bike. It said 46 miles, but that involves about 7-8 miles pretty much straight up the A5 (no thanks, too much traffic, too many traffic lights) and then directly over the highest point in the Chiltern Hills. A decent route whilst avoiding the worst of central London but at the same time not giving me masses of climbing would probably be over 50 miles - a century a day commute anyone?
Have you thought of part way commute by bike choosing the nicer parts to cycle