foundation issues

[Michael Carter]

I looked at a house that had major foundation issues. House sloped about 6 inches from front to back 1660sf one story on a not so level lot. The house was sitting on a raised foundation of cinder blocks. Was wondering just as an estimate of what the total costs would be to have someone level the house and also how long it would take. I read in a couple forums that it would take weeks because you do it a bit at a time to avoid serious cracking and damages. I saw quotes from 2K up to 30k. I am following this deal to see what it eventually sells for bcs if the right person buys it ( experience with foundations) its a very good deal. Thanks