N.H. Rev. Stat. Ann. § 353:3-b

All hotel keepers and all persons keeping public lodging houses, tourist camps, or cabins shall, upon the registration of each guest, record the guest's agreed upon departure time and date. No guest shall, without the consent of the hotel keeper or such person keeping a public lodging house, tourist camp, or cabin remain in a rental unit beyond the departure time and date so recorded at registration.