From NCL.com CruiseNext terms page.
CRUISENEXT TripleUp! OFFERBooking Window: December 29, 2022 – January 5, 2023 11:59pm ESTOffer Details: Book a Balcony or above stateroom on any sailing booked at least 6 months in advance and apply THREE CruiseNext, CruiseNext Haven or CruiseNext Lite depositsOffer valid for sailings beginning in 2023 and forward:Guests must book at least 6-months prior to sailing for any sailing in 2023 and forward