How long does it take to rebuild

Question

how long does it normally take to build from a 0 credit score to a 750-850

Answer 1

It is going to take a good number of years of responsible credit spending to go along with on-time payments.  As long as you just responsible, you'll be fine.

Answer 2

A few years, the other person just spam'd you and didn't provide an actual answer.  A major component of your credit score is length of credit history, and it will take a while to build that.  Here is a guide to building a good fico score.