In today's episode of Between Two Cairns, the hosts answer a mailbag (moodsack) question about how to stop players from endlessly deliberating about a course of action. They immediately say, "well, in Shadowdark, the real-time torch timer solves this," and then spend 15 minutes trying to come up with a general solution for other games. (They settle on "whatever's right for your game.")
I know a lot of people are skeptical about Shadowdark's torch timer, but it solves a real problem I think most DMs have encountered at some point, sometimes in every single session. I have some deliberators who play in my Shadowdark game, and even though we're playing online, I can feel their eyes watching the clock when they start discussing what to do.