You can set the Default Minimum and Maximum Length of Stay in Rates and Availability menu
- Click on Base Rate
- Choose your roomtype
- Click on ADD INTERVAL

Choose Start Date, End Date then set your Minimum / Maximum length of stay
Reservations will be refused unless the guest agrees to create a reservation for the minimum/maximum

If you have the Availability Matrix feature enabled, you can use the "Long Term Interval" to update multiple dates and room types at the same time.
The Availability Matrix allows you to visually update availability for a single day or an entire date range, as well as create room blocks for specific date ranges.
More info here: https://myfrontdesk.cloudbeds.com/hc/en-us/articles/218512887
