It's down about 8.4 minutes per week. On 26% of days it doesn't work at least once, and on 12% of days it has more than one consecutive failed check. The longest uptime streak was 24 days
I've been keeping track since exactly 2 years (to the day!) because I was surprised that it seemed briefly down for me on a daily basis. Was I getting unlucky and hitting it every time, or was it just down very often? Nobody posted anything so I started answering the question for myself :p
I've been meaning to post the tracker to HN but there's a pesky bug I want to fix: the "is it currently down" stat. I don't know how this is beyond me but something in the code bugs out. So this is my first time posting about it