How many judgments? How big are they?
When you make payments to the law firm, are you getting a monthly statement of the balance? If not, you need to be prepared to later find out that the payments you've been making may not even cover the interest on the judgment, and that the amount you owe has increased since you began monthly payments.
Have you considered bankruptcy to wipe all this out?
In Florida, the judgment is good for 10 years. However, it can be renewed by the creditor for an additional 10 years.