Interesting. Using my estimates on your calculator my result was 1. Will keep the link on my bookmark, for when I want to wonder. The one I can't really figure

Interesting. Using my estimates on your calculator my result was 1. Will keep the link on my bookmark, for when I want to wonder. The one I can't really figure out (all the others I can't really figure out, but they seem easier to guess) is the last one, "Years for which such civilizations release detectable signals into space". Is 10000 too little for a technologically advanced civilization, or will most of them self-destruct because all life after that ever springs up is essentially a race for resources? Is 100000 too much? How long will we be around. It seems if we get the war thing solved among us, the ceiling could get pretty high.