11000 steps
it took me 5606 steps to hatch my snorlax that's with flame body
According to Bulbapedia, a Snorlax egg requires 10455 steps to hatch, or 5228 if it is in the party with a Pokemon with flame body.
10, 240 basic steps
Steps to Hatch: 4096
It takes 350 steps to hatch
in my experience it takes about 5,355 steps to hatch a sneasel.