USB devices can't always be within a standard cable's distance of a computer. Luckily, you can get extension cables. You can even daisy chain certain kinds to cover serious distances.

How long do you need it?

Over 5 metres? You can string these active extension cables together up to a maximum length of 25 metres.

[If you want to extend a Net-LinQ USB Connection Cable (which is used for direct USB port to USB port networking), you can go up to 170ft (52 metres). Why you would want to do this when conventional networking is cheaper, and wireless networking is now almost as cheap and much more elegant, is a mystery.]

Longer than that?!!

I can't think of a real-world problem where a 25 metre USB cable would be the best solution. Anybody out there ever needed to do this?