Well, you have to factor in time for accelerating and decelerating, too. If you don't decelerate then you'll crash into the planet at 0.80c or whatever. So that could make the trip take longer.
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"Violence is the last refuge of the incompetent" - Issac Asimov
That might be a problem for us, but I don't think it would be a huge problem for a civilization with more advanced technology. Better technology could dramatically decrease deceleration times.
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"If you have 'Peace', you simply haven't yet seen the thing that's trying to kill you." -Spathi
whereas you should be doing something like [.url=http://www.drakeequation.com/whatever] (click me)]the Drake equation (click me) [/url.] without the extra dots.
Yeah, xkcd is always hilarious. But the Drake Equation isn't really necessary now. We already know about tons of intelligent species out there - Pkunk, Ilwrath, Spathi, etc. I mean, come on!
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"Violence is the last refuge of the incompetent" - Issac Asimov