Weston Holdings Ltd. loaned $3.5 million to a subsidiary to build a plant in Winnipeg. No payments are required for two years, to allow the operations of the plant to become well established. The first monthly payment of $40,000 is due two years after the date the loan was received. If the interest rate charged on the intercompany loan is 9% compounded monthly, how long (measured from the date of the first payment) will it take the subsidiary to pay off the loan?