each clutch of eggs (which are laid above the water's surface) can produce upwards of 200 baby snails. Its a big undertaking ot raise them all which is why Lupin suggested breaking off a piece of hte clutch to raise. If you don't decide to raise the young, please crush the clutch or freeze it and discard.
I like to incubate my clutches. They hatch in about 8-9 days that way. I open them at that point into a breeder trap in order to monitor the babies eating and health for hte first month (until about pea-sized). Then I release them into the tank. Its hard to keep water quality really good with siphoning when you have two hundred grain of sand to pin head sized baby snails cruising around.
Be forewarned as well, they can lay clutches every few days for quite awhile so its easy to get overloaded with snails.