RE just mowing lawns, we mow a couple of strips of about 2000 yards of road frontage and 3 yards, about 2 acres total, sometimes as often as every 5 days. And its not unheard of to mow in January.
We've had super luck with Walmart riders.... bought one in 79 that lasted until about mid 90s.
Then bought a used 80s model that lasted until about 2013 or so and tossed a bolt in a rod, and simply bought a 300 buck replacement motor and put it in place. Going good today.
have a Bad Boy zero turn the wife finally thought it might be nice if she could get all the stuff mowed in one night instead of a couple....
But the wally one still gets work done.
IMHO if you maintain your stuff it generally lasts, as long as it doesn't have a lot of plastic parts like Craftsman chit started putting on in years past.