fixed time that is not user-selectable.

I don't know what you need the camcorder for - but I would suggest that some of the newer security cameras connected to a multi-channel digital video recorder would provide video quality you need...

http://shop1.frys.com/product/5264307;jsessionid=EnGSAYHofFCqz6Iz+5zP4g**.node3?site=sr:SEARCH:MAIN_RSLT_PG

And with Pan-tilt-zoom, you would hve remote control of the camera's view that you would not have with a camcorder.
http://shop1.frys.com/search;jsessionid=EnGSAYHofFCqz6Iz+5zP4g**.node3?query_string=&sort=price&order=desc&cat=-45926&pType=pDisplay&from=0&to=24&order_by=p04d