What is the expiration of an immediate use CSP?

An immediate use compounded sterile preparation (CSP) refers to a preparation that is compounded to be administered immediately to a patient. According to USP <797>, the expiration of an immediate use CSP is 1 hour. This short expiration time is to ensure the sterility and stability of the preparation since it is not stored for an extended period before administration. The other options are incorrect because they exceed the recommended expiration time for an immediate use CSP according to USP guidelines.