One 12 hour outage is different to 12 1 hour outages at 3am which is different to 24 30 minute outages at 4:30pm when you're trying to commit something at the end of the day. Percentage and time are both flawed ways of looking at downtime.

Downtime really matters if it's at a time you need something to be up, and Github is big enough to have users for that to be all the time. That moves the conversation from 'It's down for a few hours a month' to 'Github is failing a significant number of it's users'.