It produces the shell by itself, from a structure called pallium (or mantle).
i think it is born with a shell.As it grows, it probably changes shells.
it takes about two weeks
How long does it take a sea snail to grow
"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
it depends on the snail and its experience. if it is a racing snail, he'll be faster than an ordinary snail.
3 long hours!!!!!!
Sadly there is no name for a snail's baby besides "snail babies."
200 to 400
30 minutes
That depends on its speed.
192,280 hours
1 year
115 days
they dont lay eggs