Join Date: Nov 2000
Location: New Orleans, LA
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Welcome to BikeForums. Hope to see you around often.
Joe is right; it depends a great deal on what your primary objective is. I am no expert on cycling training, though I have done my share of reading and I used to be a runner so I have a couple of (not original ) ideas on the subject. If your primary focus is cycling, devoting 30-40 minutes, about 3-5 miles, of training time to running would be excellent for cardiovascular and aerobic endurance as well as working muscles not used so much in cycling. All cyclists could benefit from this addition since running is actually more efficient for this purpose in terms of time vs results. Running also stimulates the mechanism that keeps bones strong. But any more time devoted to running would cut into the more important time on the bike, for which there is no substitute. There was even a little blurb to this effect in Bicycling a couple of months ago.
If you are headed more in a triathlon or primarily running direction, obviously more running would be needed.
If it ain't broke, mess with it anyway!