Interest Periods. When Borrower requests any Eurodollar Rate Borrowing, Borrower may elect the interest period (each an "INTEREST PERIOD") applicable thereto, which shall be, at Borrower's option and subject to availability, one, two, three, or six months; provided, however, that: (a) the initial Interest Period for a Eurodollar Rate Borrowing shall commence on the date of such Borrowing (including the date of any conversion thereto), and each Interest Period occurring thereafter in respect of such Borrowing shall commence on the day on which the next preceding Interest Period applicable thereto expires; (b) if any Interest Period for a Eurodollar Rate Borrowing begins on a day for which there is no numerically corresponding Business Day in the calendar month at the end of such Interest Period, such Interest Period shall end on the next Business Day immediately following what otherwise would have been such numerically corresponding day in the calendar month at the end of such Interest Period (unless such date would be in a different calendar month from what would have been the month at the end of such Interest Period, or unless there is no numerically corresponding day in the calendar month at the end of the Interest Period; whereupon, such Interest Period shall end on the last Business Day in the calendar month at the end of such Interest Period); (c) no Interest Period may be chosen with respect to any portion of the Principal Debt which would extend beyond the scheduled repayment date (including any dates on which mandatory prepayments are required to be made) for such portion of the Principal Debt; and (d) no more than an aggregate of five (5) Interest Periods shall be in effect at one time.