As reported by the consumer mower manufacturers the average riding mower is used 38 hours per year and is replaced every 4 1/2 years. If I remember correctly the average push mower is run something like 3 hours per year and replaced every 6 years
for me it varies,my yard w/22" wb probably 30-40 min. reel mower probably 1 hr. and then the rest of my jobs usually under 1 hr. Growing season can double the times.