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With the caveat that the amount of stress load you're doing with these workouts, I don't see any reason why this should be a problem or even a bad idea. Back in the day, I used to do 2-a-days for workouts routinely for weeks on end. It was the only way that I could wrack up the mileage with my coursework and dining hall schedules. When 15 miles/day is a minimum of 90 minutes plus warm ups, cool downs, stretching, lifting, PT, etc., you have to find ways to fit in your life around the workout.
As with anything, building up to this is key and you can't start it cold. You may want to start out with a slightly less aggressive goal than 20 minutes for the first week and then work into it. But yeah, when there are folks that routinely do much more than this on a daily basis, I think it's easily possible if you have the time.
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