ExOkie,
When you apply for the new one you have to send your old one back. They will return it with holes punched in it like Lan says. Don't worry they are small holes and the various exit and entry stamps are still readable and able to bring back many fond memories.
About the length of time they have to be good for. It's just like a lot of things having to do with Belize one site gives information (like I posted) another gives info like Moose posted!
He is probably right - after all you learn (when living up in the cold north) that you NEVER argue with a Moose!
But after all that is one of the things that makes Belize, Belize and I love it all the more for just this type of thing!
Byron
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Lie, Cheat, Steal - Lie with someone you love - Cheat Death, Steal time to be with friends