In a hospital setting how many cardiac monitors should one monitor tech be watching?

I am sitting here watching 5 screens, I have the potential of watching 80 patients yet I rarely watch over 40 patients. (today I have a comfortable 29).If the screens are well placed, I really dont think it is an issue of how many screen but how many patients and how sick are they. The rumor I hear in the tele tech world is 80 patients. I really don't think that I could watch 80 patience safely. This is a question that is very important to ask, and I see that the answer will have to evolve. This is a fairly young proffesion and needs to be evaluated and standardized.