Well, I don't know how long it took for them to cook the beans they had. In my wife's case, it's about an hour, hour and a half, give or take. I think she lets the water get to a decent boil and then turns down the heat so it's a little softer, but still plenty hot and then let's them go. It also depends on what else she's doing, because sometimes she cook them a little longer. Generally when she's doing this it's to go with Mexican food, so we'll eat them whole or she'll mash them and refry them. In that case, she might leave them in a little longer cooking.