I think people confuse the question of repair versus maintenance. You repair it when it’s broken , you maintain it before it goes bad.
If you say I got X number of years or miles out it before I fixed it , you are not talking about when you should maintain it, you are talking about life cycle.
Maintenance cycle is meant so that you don’t have to repair and by definition is shorter. The length of the maintenance cycle is before the earliest failure, not the longest time to failure.
Example , if you never changed the oil in your car, the engine would last a lot longer than 6000 miles.