Sony Vegas "Capture using a timer question"

I use Sony Vegas v8a to capture video, it works well, but I can't seem to find the timer setting. When I capture a 2 hr video, I have to manually start/stop it.

Is there any way to set it up on a timer to stop in 2 hours (or so) on it's on? I am using a Blackmagic capture card, and I notice that vegas has some sort of timer settings when you pull up the capture window, but these are greyed out.

Thanks for your input on this.

11-29-07
I figured it out.