The egg goes through cycles. Normally ten. Every 255 steps you take the cycle goes down one. However it is not always ten, keep that in mind. Hope this helps some.
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Have a Slugma in your pack (his ability, Flamebody, cuts in half how many steps you have to take to hatch an egg) and also ride your bike to at least through 5 cities.
I found approximately 5,000 steps.-If you have a Pokemon with Flame Body (Such as Slugma from the Hoenn Region) as your first Pokemon, it should only take approx. 3,680 steps.
Probably about 500 to 600 however this can be lessened up if you have a slugma second in your party and your egg in the first spot.
Steps to Hatch: 4096
It takes 350 steps to hatch