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I just purchased a pump, manual. My question is how long do you leave it pressurized? I can get a semi-hard erection before the pump, but with the pump I can get that back to regular strength. I see guys talking about using the pump to I guess exercise the penis. How long do you pressurize and how often?
Also, how do I keep my nuts from getting sucked into the pump?

On FrankTalk in the forum General Discussion there is a topic called Documents Worth Reading List that has a subheading of Vacuum Erection Devices. In that subheading you will find links that answer your exact question.

You could try packaging your nuts with a smaller silicone cock ring.