I would have agreed with you a week ago, but now that Pancakes is in the dungeon I think the risk that there is a warden near enough to hear you when you don't sneak in the Black Mines is so high that sneaking seems like the smart thing to do even when short on time. Basically the question is what is easier to survive, escaping from level three at max clank or attracting warden aggro. Though that might change again with Tango adding more evokers.