La. Civ. Code art. 1928
Current with changes from the 2024 First and Second Extraordinary Sessions
An offer that specifies a period of time for acceptance is irrevocable during that time.
When the offeror manifests an intent to give the offeree a delay within which to accept, without specifying a time, the offer is irrevocable for a reasonable time.
La. C.C. § 1928