A financial calculator is recommended.

Dax borrows $500,000 and the loan is governed by compound interest at an annual effective interest rate of 4.25%. Dax agrees to repay the loan by ten equally spaced payments, the first four of which are for $21,000 and the next six of which are for $76,000. When should he make the first payment? (Round your answer to three decimal places.)

He should make the first payment after ___ years.