One of your customers is delinquent on his accounts payable balance. You$$ve mutually agreed to a repayment schedule of $$640$ per month. You will charge $1\mathrm{.}06\%$ per month interest on the overdue balance.

If the current balance is $$11,842,$ how many years will it take for the account to be paid off? $($Round your final answer to $1$ decimal place. Do not round intermediate calculations$).$