probligo - I'm curious about the hand-launch gliders. How high can you launch one and how long do they stay aloft?

I know it depends a lot on the launching technique, but one reason I never got into gliders is because walking three hundred feet to stretch a high-start, launching your plane and doing it all over again 3 minutes later has to get old pretty quickly.

I've got a good throwing arm, so maybe this is the way to go. What can you tell me about them?