Huh? The flakiness of a standard uplink will have you down for 44 hours a year? On what planet? With our non-AWS hosting providers we tend to see 2-4 hours of network issues per year. Heroku's uptime also hasn't historically been anywhere near 99.97%. They were down for several days last year in The Great AWS Failure.
I don't think anyone ever considers hosting it on a desktop in the closet on DSL at home/office.
The competition for something like Heroku is EC2, VPS, or dedicated servers, in commercial colocation facilities. A good hosting facility is going to be a lot closer to 99.995% uptime for network and power to the box, but you can of course screw up past that point on your own.
Having administered several "standard uplinks" from 100 Mbit/sec all the way to multiple ten Gbit/sec links, I can safely say that if your transit isn't 99.999%, you need new transit.
