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The relics at the landing site will be there forever, with the caveat that there is weather on Mars. There are global sand storms for example. Most likely the tracks have a visible life of centuries, the equipment will be visible for millennia. The stuff on the moon, however, baring meteor and asteroid impacts, will be there on the scale of tens of millions of years as there is no weather to disturb the sites. EDIT! I knew there was an epic image to share! https://thespacereporter.com/2016/04/opportunity-photographs-mars-dust-devil/