The Win95 49.7 day bug was caused in a hardware timer that rolled over to 0. When that happened, it crashed. As far as your 187 day uptime goes, I have a Freesco router/firewall/http/ftp system that continuously runs the entire duration between power outages. 9 months isn't uncommon. It hasn't had a keyboard or monitor hooked upto it in the last 4 months, and the last time it went down was because I was replacing the normal HSF with a Xeon heatsink w/o fan to reduce noise.
Anyone wonder what happens to planes that happen to be trying to land during the 30 day reboot?