If you search for minimum nights, you will see that a lot of people have trouble with this setting.
Inside OR you need to set them up in several places
Property -> Rules
Settings -> Seasons -> Create Seasons (overwrites above)
Settings -> Rates -> Spot Rate (overwrites above)
These can all be overwritten by settings in PriceLabs
PRICELABS
From highest (#1) to lowest priority (#8), the rules are as follows:
BOTTOM LINE
It would be very nice to have this simplified and have a message showing what rule will be applied.