2-3 weeks.
the water won't affect the eggs and they still have plenty of time to hatch
Depending on the species, and how long ago they were laid before you notices, roughly two weeks from now they should hatch.
Yes they will die if you do take them out of there tank BUT they hatch them self
The answer is that they produce eggs by putting them in there egg sac and then after 2-3 months they have the babies first they put the babies in the nest and leave them to learn on there own.
Robin's eggs typically take about 12-14 days to hatch.
Robin eggs typically take about 12-14 days to hatch.
Robins typically take about 12-14 days to hatch their eggs.
Budgie eggs typically take about 18-21 days to hatch.
It takes 2 to 3 days for the eggs to hatch.
"After about 3-6 weeks depending on species and temperature, the babies emerge" see: http://wiki.answers.com/Q/How_do_mystery_snails_reproduce_and_how_many_offspring_can_they_have_at_one_time
They don't lay eggs.