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.
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11000 steps it took me 5606 steps to hatch my snorlax that's with flame body
10, 240 basic steps
Steps to Hatch: 4096
It takes 350 steps to hatch
It takes 5,120 steps to hatch Gligar in a Egg.