I'm with the naysayers. The kind of individual who can manage an 80 mile round trip 3x/wk doesn't post to BF asking about it. S/he does it and posts here to tell us how it's done. No harm in trying, however. If you think it will take 3 hours though I would allow 3.5. Four would even be better at first. If you owned a business I'd say you had a shot at something but... intern in city government? You will either be an ex-intern and budding junior cyclocross champion or a sorer but wiser bike/car/mass transit advocate on the way up the career ladder in city government.

H