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Engine hours
Also: hour meter
The running total on a machine's hour meter — the unit maintenance intervals are actually set in.
Manufacturers publish service intervals in hours, not months. A greens mower doing 400 hours a season and a rough unit doing 900 hit the same interval at very different points in the calendar.
The only hard part is capture. If nobody reads the meter, the interval is a guess, and the first symptom of a missed service is usually an expensive one.