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Not sure what is meant by "S3 has 11 nines of durability". Obviously not an availability number, but what is it?

99.999999999% uptime?

... which translates to 3ms of downtime in 10 years with their current data, which makes no sense.

I'm guessing it's closer to the way that telecom guys work: 1 bit error in 10^12 bits is common for fiber comm.

Looks like they're differentiating between durability ("99.999999999%") and availability ("99.99%").

So it's not uptime that has 11 9s…my mistake. Should have checked the documentation.