Annualized outage minutes is the wrong metric. If my company's email is down for fifteen minutes, twice a day, at 2am and 3am, that's over a week of downtime. But we might not even care.

If I lose a whole day, we lose all the productivity for that day and delay countless upstream and downstream efforts by a day.

The distribution of those minutes matters.

That's true, but it's more true for some companies than others. A lot of big companies cross time zones.

I suppose "unplanned outage minutes" would be a better metric. I still expect most companies to be worse on that metric. Most companies are just bad at running services reliably, especially when it's not their core business.