Well... I am currently feeding 8 composite video cameras to an 8ch DVR/Switchbox and an 8ch Switchbox. The DVR is located in my radio/computer room and the switchbox is located in the `master bedroom'. I just used some BNC `Ts' to split the feeds and a couple `4 port to 4 twisted pair cable' BALUNs to connect between the 2 locations. I also have used `Ts' at the front and back doors to provide a signal to small monitors at those locations to enable checking out who might be there before actually opening the door if we haven't first checked on one of the other 2 monitors. So far I haven't noticed any degradation of the signals though the 2 door monitors have only been in use for the first part of this year.
Depending upon what type/quality of your cabling, distance of the runs, ETC "your Mileage May Vary". Choose your longest run, or runs, and give it a try before going all out.