How bad are the roads where you live? That’s going to be the main factor. One of mine failed after hitting a pothole. But then again, another failed just taking off from a traffic light. Like Akirby said, periodically take a look at the boot(s) and check for leaks/damage. A grease leak will be fairly obvious, you’ll see it splattered all over the undercarriage. If you have a needle fitting and a grease gun sometimes you can worm the needle behind the band holding the boot in place and inject grease into the joint if you squeeze the boot and suspect it needs fresh grease. Depends on the type of band they used on it.