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Gmail seems to have 3 nines, although I couldn't find a better reference than this [1], where other services are included:

> [Google's infrastructure] delivers Gmail and other services to hundreds of millions of users with 99.978% availability and no scheduled downtime.

[1] https://support.google.com/googlecloud/answer/6056635?hl=en

PS. 99.978% availability translates as a downtime of ~ 2 hours/year total. Not bad! But it's when things break that we realize how performant and reliable they actually are.

Edits: various typos.

I'm consistently amazed how well Google and Facebook are at staying up. They're two services that I don't think I've really experienced a broad outage. Of course with Facebook's data designs, there's sometimes quirkiness as a result, but it's rarely completely off for me.

Google, I think I've only really noticed it offline once in the past 10 years or so. Not complaining at all.

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