We could extend this to all the other shows, too. ENT gives us hard data on how the Warp Five engine behaves on the Earth-Neptune-Earth run, but the same engine performs the Earth-Qo'noS run immensely faster in the very same episode.
It would have to be for 80 hours to make sense

However, this won't solve the internal problems of TOS. If the engines are fast in the interstellar "subspace vacuum", then every location Kirk visited should have been pre-visited already.
Ah, good point! I'll switch my argument to other dubiously close locations that Kirk is the first to survey, then. Say, Pollux in "Who Mourns for Adonais". Or even the distant Rigel and Deneb (assuming they are Beta Orionis and Alpha Cygni, respectively, and not other stars with the words "rigel" and "deneb" in their names), which could have been reached in a day at the anomalous warp 8.4 of "That Which Survives".
Even dubiously close doesn't always mean visited or explored. Could we say in the days of sailing that every nearby island was visited by ships even though it would've been a quick trip?
As to "Who Mourns for Adonais" are we so sure that Kirk was first to survey it?
CAROLYN: Here's the report on Pollux Five, Captain. This entire system has been almost the same. A strange lack of intelligent life on the planets. It bugs the percentages.
...
SPOCK: Pollux Four. Class M type planet, oxygen and nitrogen atmosphere. Sensors indicate no life forms. Approximate age four billion years. Judged no reason for contact. In all respects, quite ordinary, Captain.
As far as we know, this system was surveyed before at a distance and bypassed because of the "lack of intelligent life". It could be that it is only until Kirk's ship is on a followup to map the planets from close-range (orbit) that awakens Apollo....
SPOCK: Pollux Four. Class M type planet, oxygen and nitrogen atmosphere. Sensors indicate no life forms. Approximate age four billion years. Judged no reason for contact. In all respects, quite ordinary, Captain.
I'll look at the other places to verify and check back later.
Not above Tom Paris' definition of that warp factor, which is a show-internal reference and also one in accordance with most of the travel time feats of the TNG hero ship. That is, if the E-D couldn't do four-digit speeds with ease, basically every pair of locations visited in an episode would have to be neighboring star systems or worse.That estimate of hers puts "maximum speeds" at slightly ABOVE Warp 9.
I'm not following Timo. When does Tom Paris define Warp 9?
Let's remember that it's Riker's hipshot estimate, not a Data figure... Although to be sure, Data was present and no doubt ready to correct Riker on tactically erroneous estimates.TNG's "Bloodlines" puts Warp 9 as 833c.
It's an outlier in any case, and might be attributed to their target Bok residing in the shallow space of a star system, where even warp 9 gets quite slow as per "Paradise Syndrome".
Is there a specific episode from Tng+ that gives a different value for Warp 9? Otherwise, "Bloodlines" is the only data point we have for Warp 9 and not an outlier.
Regarding Janeway's estimate, it probably won't take into account repairable damage because that would get repaired in 75 years. But it may well be what the field manuals tell her about the true sustainable speed of her ride on long voyages, because it appears to be in rough accordance with the estimate Barclay uses for the ship's speed in "Pathfinder"...
On the other hand, Harkin's estimate is based on actual flight times and local conditions instead of Janeway's guesstimate of a straight non-stop trip at max speed back home.
From "Pathfinder":
HARKINS: The Delta Quadrant, sector 41751, grid nine. Voyager's doctor reported this as the ship's position when his program was briefly transferred to Starfleet two years ago.
Assuming they're still on course for Earth we've been able to extrapolate a range of likely trajectories.
Estimating an average warp speed of six point two, and accounting for various astronomical obstacles, we can reasonably assume that Voyager is now in one of these three sectors.
Interestingly, this is a Season 6 episode and they've traveled about 10,000 LY. 10,000 LY in 6 years averages to about 1,666c* or only 45 years to get home. Assuming they're still on course for Earth we've been able to extrapolate a range of likely trajectories.
Estimating an average warp speed of six point two, and accounting for various astronomical obstacles, we can reasonably assume that Voyager is now in one of these three sectors.
*However, I seem to recall that Voyager may had some alien boosts so I'm not sure that average speed is just at warp alone.
BARCLAY: Is it really so wrong? Do you have any idea what it must be like for them to be stranded sixty thousand light years from home?
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