Freeze Frame Exposure Time?

Is there some standard amount of exposure time for a "video camera/capture card"
freeze frame? If so, what is it? I have a Supercircuits PC23C and a Hauppauge WinTV
GO capture card.
--
Wayne T. Watson (121.015 Deg. W, 39.262 Deg. N, 2,701 feet, Nevada City, CA)
-- GMT-8 hr std. time, RJ Rcvr 39° 8' 0" N, 121° 1' 0" W

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