Just learnt the hard way there really isn't much more in it than 5 meters.
9 or 10 meters did not work any more, so don't even try it, even with the old slow USB.
Solved the problem by putting the HUB in between. Not nice, not what i would have preferred, but works.
PS2 had no problem with 10m total.
I guess there is no point in even trying to run the LPT for 8 or 9 meters...
Strangely it seems i extended that USB camera with some simple phone cable for at least 10 meters and it still works nicely, but the hub is not recognized any more.
ST