I've had two down for months:
2002 WRX was wrecked and it took 7 months to repair
2004 Cobra pretty much a downward spiral of downtime over the year I owned it.. I believe it was down for 3 months when I did the turbo kit - and the guy that owns it now has it down too for a solid rear end and an auto.
My current truck and the z06 I sold had 0 days downtime. Unlike Kirks webserver