Final answer:
Express consent can have an expiration date or it may be indefinite, depending on the specific context and the agreement made. Consent is generally valid until it is withdrawn or specific conditions are met. For example, a contract may specify an expiration date for consent given by one party.
Step-by-step explanation:
Express consent can have an expiration date or it may be indefinite, depending on the specific context and the agreement made. In legal terms, consent is generally valid until it is withdrawn. For example, if someone gives their consent for a medical procedure, it remains valid until they revoke that consent.
However, it's important to note that the expiration of consent can vary in different situations. Some agreements may specify an expiration date or a time frame within which the consent is valid. In other cases, the consent may be considered valid until certain conditions are met or circumstances change.
To provide a concrete example, let's consider a contract between two parties. If the contract includes a clause stipulating that the consent given by one party is valid for one year, then that consent would expire after one year unless the contract is renewed or modified.