That varies greatly by manufacturer and configuration. SKF uses as a guideline 40 or more for a tractor, 60 or more for implements and trailers, 35 or more for a combine harvester, 80 or more for specialised harvesters, 30 or more for a baler, and 60 or more for sprayers and slurry tankers. We count them during the machine scan and record them in a lubrication plan.