(1) The debtor promises to his means permit him to do so. -- The obligation shall be deemed to be one with a period. In this case, what depends upon the debtor's will is not whether he should pay or not for indeed he binds himself to pay. What is left only to his will is the duration of the period. If the debtor and the creditor cannot agree as to the specific time for payment, the court shall fix the same on the application of either part. (Art. 1197. Part 2)