Here are a couple of my uptimes

fw2[xxxxx]# uptime
5:26PM up 336 days, 15:14, 1 user, load averages: 0.00, 0.00, 0.00

fw4[xxxxx]# uptime
4:18PM up 395 days, 57 mins, 1 user, load averages: 0.07, 0.05, 0.00

fw3[xxxxx]# uptime
4:19PM up 395 days, 1:12, 1 user, load averages: 0.29, 0.20, 0.16

All are running freebsd I have about 24 freebsd boxes that all have uptimes of at least 100 days....