I have unsub and subsid loans at 2%, and I owe $30,000. My payment is 8 months ahead of time, and my payment is $111.00, and I pay $150.00 s month. How do you figure out how long it will take to pay this debt, and is it worth paying more. Am I making a debt in the principal by doing this, or is it going to take me even longer to pay my debt off. agnesnethel