Minimum/Maximum Nights - Setup
Minimum/Maximum Nights allows you to require a minimum and/or maximum night stay per room. WP Hotelier already provides a similar setting for that in the core free version. But it works globally, not per room.
To require a minimum night stay on a specific room, edit it and select At room level (or At rate level if it is a variable room) in the Min nights type dropdown. To require a maximum night stay, use the Max nights type dropdown instead.
You are not obligated to set both options (minimum and maximum). And if you leave the options at the default value ( Use global settings), the values set in Hotelier > Settings > Rooms & Reservations > Minimum nights and in Hotelier > Settings > Rooms & Reservations > Maximum nights will be used instead.