Not really. The German phone and power networks get quite close to this reliability. I've had less than 30 minutes combined downtime in my life.
Nowadays, you can look into your router logs. And Telekom had serious issues with their VoIP stuff.
Likewise, even the apparently planned outages at my previous location exceeded the 30 minutes. (It's still good, but not that good.)
Yeah, they're starting to do maintenance here now, too (for introducing the 500/200mbps VDSL2), but I've never been with Telekom, and my existing ISPs never had real issues.
As I have a computer constantly connected to a server via SSH, and have to manually reconnect whenever it fails, I'd think I'd notice.