Check page 742. It's all there if you read carefully.
organofcorti suggests a figure can be calculated of what duration into a round is a good time to leave if you have not found a block. I'd assume, as it's time, it would be minutes or seconds or something like that. Page 742 says
The "RESULT" is the Erlang distribution cumulative distribution function p-value.
which, as I said, does not make any sense to me, as I'm not a stats expert.
I'm just asking because I'm curious. If it's some kind of Fight Club rule not to spell it out, then fair enough.