baby snail question

[hawkfishman]

i woke up this morning to find about 17 white snail eggs scattered about in my tank, mainly on the back wall. my question is this: how long do they take to hatch/grow or w/e and after they start growing, what is their "general" growth rate? im under the assumption that snails generate thier own shells and "make" they as they get bigger. is this correct?
thanks in advance

 

[hunt]

They will almost never grow to adult, ine had my tank two years and have never seen a baby snail over 1/4in

 

[hawkfishman]

cool. my friend had some come up in his 29G bio-cube. i saw one of them and yea, it was smaller than a 1/4 of an inch. are they a certain kind that just doesnt get big or do they just have that slow growth rate?