My Daughter is a member of Crew on the Sapphire Princess - she told me around 1 Month in Dry Dock, Portland Oregon after arrival in Vancouver BC on 12th April. Not sure the full extent of refurbishment but an upgrade to the main Theatre is one of the them. She joined the ship in March and will be with it until end of her contract in September 2023. In her case the previous Crew she was replacing left the Ship in Santiago Chile on 19th March.
I'm not sure whether any new Crew will be on the ship as Contracts etc run across differing dates for various Crew i.e. Entertainers, Engineering, Chef/Cook, Cleaners etc