FAR 1.706
Expiration.
Expiration dates are required for class D&F’s and are optional for individual D&F’s. Authority to act under an individual D&F expires when it is exercised or on an expiration date specified in the document, whichever occurs first. Authority to act under a class D&F expires on the expiration date specified in the document. When a solicitation has been furnished to prospective offerors before the expiration date, the authority under the D&F will continue until award of the contract(s) resulting from the solicitation.
Source: acquisition.gov — FAR
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