[ainar-g]

The Opportunity rover had a planned mission duration of ~93 Earth days. It went on to serve for ~5,500.

[wolverine876]

I wonder how credulous I've been about those estimates. Underpromise, overdeliver is an old tool for managing expectations. I wonder what NASA really expects for these projects.

(The projects are still amazing; I'm not complaining about the engineering or performance!)