Keeping your lawn mower in excellent working condition is a big part of maintaining a beautiful, healthy lawn, and it’s also key to ensuring your lawn mower will last as long as possible – approximately 10-15 years. Performing regular maintenance on your lawn mower, particularly its engine, will extend your lawn mower’s life and help it work its best all season long. Either way, lawn mower maintenance is something that should be done at least once a year and will only take a few hours to complete.