I started doing daily builds of the Debian Installer in February 2004. (Before me, Martin Sjögren did them for a while.)
Seven years of building d-i every single day, twice a day in recent years, and also twice a day for armel. Well over ten thousand builds total. That would have been tedious, but thanks to cron it was instead seven years of keeping the machines running and upgraded, dealing with things when they broke, and getting highlighted on IRC whenever someone mentioned "people.debian.org/~joeyh/d-i". Still a bit tedious, but those bits were used to install a lot of machines.
The rest of the d-i daily builds moved onto the autobuilders a while back, but I guess there was some reluctance to mess with my institution. I finally convinced them to take over my builds too. :)