^ Oh, I agree wholeheartedly. The only series to even remotely hew to those is Voyager, and even then just at the beginning (75 years at roughly 1,000 ly sustainable per year or so). But sometimes all we have to go by is the Trekpedia and not-necessarily-canon supplemental materials, such as the Star Charts book. I meant to give those figures to Mr. Hartzilla as an example.
I find it difficult to believe from a celestial point-of-view that the Ent-E could go all the way from the RNZ to Earth in just over an hour, even at "speed of plot". From a Trek tech point-of-view, the only thing I can think of off the top of my head is that as starships have cruise speeds, maximum sustainable speeds, and maximum 12-hour-duration superspeeds, they must therefore have a super-max, 1-hour, she-can't-take-much-more-o'this-Captain super-duper-speed, for those of us fans who demand a Treknology-satisfactory explanation.