Well, I don't think that was really called for. Seriously, these guys are there to make sure we have an entertaining story, and things such as consistency of travel times is not the highest of their priorities (rightfully so).
I'm rewatching Enterprise's first season, renewing my appreciation of the series. Trust me, how long it takes the ship to get from point-A to point-B is the last thing on my mind. The shows have always been (or, at least, are supposed to be) about the people. The technology is only there to get them to where the story is.
Davy Jones
"Frightened? My dear, you are looking at a man who has laughed in the face of death, sneered at doom, and chuckled at catastrophe! I was petrified."
-- The Wizard of Oz