; and (B) aggregate amount of loans under this section an undergraduate student may borrow shall be equal to $30,000. (4) The maximum— (A) annual amount of loans under this section a graduate or professional student may borrow in any academic year (as defined in section 481(a)(2)) or its equivalent shall be equal to $13,500; and (B) aggregate amount of loans under this section a graduate or professional student may borrow shall be equal to $40,000. (5) The length of repayment— (A) for a loan borrowed by an undergraduate student shall be 15 years; and (B) for a loan borrowed by a graduate or professional student shall be 25 years. (6) Repayment on a loan made under this section shall begin— (A) after 125 percent of the normal time for completion of the program of study for which the borrower receives the loan under this section