think about a stage snake.. that might run 100's of feet. and for real big stuff.. its gonna be real long. I wouldn't worry about it, in our position. I have run like 50 ft cables before, and no problem. i think the little resistance that it does have, isn't enough to effect anything by any measurable term. i think its more the connectivity that exists between the cables, if your using more than one cable and having the connections, having to transfer from one cable to another, but all in all, i don't think it makes enought difference to really worry about.. good luck.
matt