Please help

Oppenheimer Bank is offering a 30-year mortgage with an APR of 4.99% based on monthly compounding. With this mortgage your monthly payments would be $1,968 per month. In addition, Oppenheimer Bank offers you the following deal: Instead of making the monthly payment of $1,968 every month, you can make half the payment every two weeks (so that you will make 52/2 = 26 payments per year). With this plan, how long will it take to pay off the mortgage if the EAR of the loan is unchanged? Note: Make sure to round all intermediate calculations to at least 8 decimal places. The number of payments will be which is approximately years. (Round to two decimal places and enter the years rounded to the nearest whole number.)