If you are 85000 in debt how many years are you in bankruptcy?

Presumably your meaning under Chap 13 a wage earners plan:
It depends on many factors...your income mainly...but basically how much of the income can be reasonably budgeted to pay off the debts, above your needed life expenses. Please consider the 8500 isn't very much money really...it isn't even half the cost of most standard new cars, which are commonly paid off, with interest, etc. in not many years.