As astronomical surveys have progressed, each record holder has been unseated by the next, with champion masses heading toward one hundred billion times that of the sun. A black hole of that mass has an event horizon so large that it would stretch from the sun past the orbit of Neptune and a fair way toward the Oort cloud. Even if you’re a bit rusty on Oort and his distant cloud, just know that it takes sunlight well over one hundred hours to reach it, so we are talking about a black hole with a monstrous span.
