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I was thinking something like Retro (by @sonny), only that the screen counts down how much time is left. And you can add as many custom buttons below the screen as you want, with however many min/sec that the different speakers can speak.

So that when someone who has been allotted 10 min goes on stage you click the 10 min button, and it starts counting down, and when the speaker who has 2 min start you hit the 2 min button, etc.

So many seminars in the world, surely this exists?

#askfedi