Because most of my Tours are tube-optimized they do not have videos. I removed them thinking the visitor came 'pre-sold' after watching a vid on a tube so therefore would not want to sit through another video. Also most of my vids were in Flash and would not play on Android devices.
But some sites I update daily with fresh preview vids (helps with bookmarkers) and some I do compilation videos. My 'sweet spot' is between 1-2 minutes. Thirty seconds always seems to short a time for me but I am old so....LOL Who knows what really works, depends on your content, traffic and overall approach I suppose.
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