How fast can I refinance a single family house after buying it?

[Zion Bar]

I hope this is the right place to ask im a member in a ton of forums but this one is def a little-overwhleming with the 2 million sub categories here :) lol

Anyway, Im going to buy a single family house / duplex in below market value

I was wondering how fast I can re-finance and use the equity in the house to buy another one? 

thanks in advance

Zion