No, there is no limit. You can purchase multiple units of the same Time Deposit product. Even if you buy the same investment product, the earnings will be calculated respectively.

For example, if you buy a 30-day Time Deposit worth ₱1,000 on October 1, it will mature on October 31; if afterward, you buy a 30-day Time Deposit again worth ₱500 on October 5, it will mature on November 4.