Our little guy quit at about day 13-14 (as far as I can tell). We waited till about day 24 to open him up... it wasn't great, but a good experience for all. We're still hoping to get some more eggs, but it'll have to be next year as this school year is almost done. Thanks for all your advice and interest!
...oh. And if anyone knows anyone who will ship eggs to Hawaii for a fair price (and a small minimum amount), please let me know. I'm having trouble finding that!