ALOS
Rooms
Average length of stay
Average number of nights per stay.
ALOS = room nights sold (or guest nights) / number of arrivals
How to read the metric
Longer stays cut check-in/check-out and housekeeping costs but need a full programme; managed with length-of-stay controls (MinLOS).
Worked example
2 160 room nights / 240 arrivals = 9 nights.