That can depend on how pro-active you are. First thing, pull all your 3 CRs and make sure that everything shows $0 balance and included in bankruptcy. If there is anything else, like 'discharged' or not paying, etc. dispute those. 2nd, try and establish a secured card and use it for gas or something you do every month and PIF. Only apply for things sparingly and keep your utilization waaaaaay down.
If you do the above you will have a better chance of establishing something... and then you just need patience.
Chapter 7 will "affect" your credit for 10 years.
While some lenders will extend credit with the BK after a period of time and good patterns in current credit, your FICO and CR will allways be taking a certain hit from it. And some lenders have a zero tolerance for any type of BK.