22 September 2008
Opportunity was designed to live for at least 90 martian days (sols) and drive about 800 m. Today is sol 1658 and Opportunity has so far driven about 12 km (11,797.91 meters, to be precise). It’s not certain that we would make it to the large crater, and a lot of people are doubtful. But then, they would have been doubtful if you told them the rovers were both going to last more than 1600 sols, so who knows!
For more information on this, check the JPL press release.