[PeteB570]

Doing pretty good for a critter that’s been hanging out alone going on 4 years next month.

Ah, that’s not counting transport time to Barsoom.

[gbunch]

Doing pretty good for a critter that’s been hanging out alone going on 4 years next month.

And don't forget the small MERs (Mars Exploration Rovers) Spirit and Opportunity which landed on Mars in 2004. With a planned mission life of 3 months, Spirit functioned for 6 years, and Opportunity is still working today!

See the official MER page here.