This sets the minimum booking period for this room at all times.
Individual rates If you set the Minimum Stay here this can have different minimum booking periods which can cause not be lowered with any other setting, (Prices/Calendar) Set you base Minimum Stay (the actual lowest you ever allow) here and increase your minimum booking stay, say for a special weekend/period on any day to be higher but not lower than this value., in (Prices/Calendar) The hierarchy order : 1) Room Setup 2) Prices 3) Calendar