It all depends on which kind of Egg; Riolu eggs take longer to hatch than say, a Caterpie Egg. To be sure, go to Bulbapedia.org or Serebii.net (must-know websites for Pokèmon Fans)
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i don't have Pokemon emerald, but the answer is always the same. not how long. how many steps. walk ALOT and the egg will slowly start to hatch
3000-5000 steps about im not 100% percent sure
It takes 10,496 steps for a Larvitar egg to hatch.
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It Takes 5100 Steps to Hatch Staryu EGG