drlynn- both were somewhere around 45 minutes @f2.8 on a 50mm lens as I recall. Didn't write anything down, was playing around more than anything else.
No filters, though I did darken it immensely in PS, as the slide was overexposed to the point that it looked like a daytime shot & the trails were barely visible.
Next time I'll use a smaller aperture and go somewhere with less ambient light. I think I'll try the 24mm lens I picked up too, just for grins.