I think it would make more sense to measure the longest computation in the number of cycles executed rather than in seconds. If I'm not mistaken, Voyager 2 had

I think it would make more sense to measure the longest computation in the number of cycles executed rather than in seconds. If I'm not mistaken, Voyager 2 had a processor running at 4MHz. So a modern 2 GHz processor will execute more cycles in a couple months than a 4MHz processor in 50 years...