The Opportunity rover was initially scheduled for a 90-sol mission on Mars, with each sol (a Martian day) being slightly longer than an Earth day at approximately 24 hours and 39 minutes. However, the rover far exceeded expectations, operating for nearly 15 years after landing on Mars in January 2004. Its mission formally concluded on February 13, 2019, after NASA was unable to re-establish contact following a global dust storm in 2018 that prevented the rover from recharging its batteries. Throughout its operational time, Opportunity made significant contributions to our understanding of Mars, outperforming its planned mission duration by approximately 55 times.