Hey there Ric - congrats on the purchase
I think something's been missed here. To do long exposures you need two cables, not one.
The standard (or whatever length you want or get) USB cable will control the camera via the EOS Utility or, as Geoff has stated, ImagesPlus. That's great if you want to control it for exposure and focus remotely for exposures from the fastest right up to 30 seconds.
If you want to go beyond 30 seconds, i.e. bulb, you'll need the ShoeString USB to headphone-type jack that lets the software control the bulb exposure as well via the shutter remote plug on the camera. The standard USB to USB cable won't allow bulb exposures to be taken.
Here's a 20-foot long one:
http://www.optcorp.com/product.aspx?...9-327-331-8452