I don't think I have ever seen that spec'd out anywhere, and they will differ for each model depending on box size. You can get a rough estimate with a tape measure and then buy some extra aircraft cable to be certain and to allow for termination.
The longest run for a corner mounted winch would be the corner farthest away from the winch, (not crossing the doorway). That one would be roughly 2*trailer width + 1* trailer box length (allow extra for termination as mentioned).
The shortest run would be the post directly over the winch and would be about 2*width.
Pop open the covers over the cable runs and you will get a good idea of what the run looks like and can get a quick rough measure.
This applies to corner jack trailers with internal cabling. There are older models out there with jacks on the tongue and cables that run outside under the frame which would have very different lengths.
ETA:
Thinking it through the shortest cable is actually the post on the same wall as the winch but opposite, at roughly 1*width.
That leaves the 4th cable as approximately 1* width + 1* length
The 5th cable is the takeup cable that spools onto the winch and connects to the yoke with the 4 post cables. It would also be about 1* trailer width (roughly).
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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