My bank account just had a levy placed on it by St.Louis county Missouri for a civil judgement against me. Will the levy stay in place until the entire amount of the judgement is collected or is this a one time seizure of the money in the account?

Your account will be levied until the amount plus interest,etc is satisfied.

This letter or notice of levy I got doesn't say anything about the amount of the levy or interest amounts at all.

The papers you recevied from the court should tell you the amount. Were you not aware of what you owed? Or call the bank and ask for the number that is on the papers they got from the court You got to have some idea of what you owe

Was the letter from the bank, or from the court, some states require notice that you are going to be levied ( they time the letter to come normally day or day after they have already froze your account.

But the actual judgement against you, that you should have been aware of, would say exactly what is owed and to who