No way of telling. Depends on what else you're doing and what your eating habits are.
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Take 200 divide by 20!
not sure what MPR is but if it's 200 MPH it'd take you 15 minutes
http://www.wolframalpha.com/input/?i=200+miles+at+70mph
18 seconds to travel a mile at 200 mph.
200 / 25 = 8 hours