The clock
Every turn has 30 seconds, in every mode. A ring runs around the deck on your turn, and around the panel of whoever is playing otherwise: it starts green, turns amber, then red.
Drawing a card does not restart the clock — the 30 seconds cover the whole turn. The last five tick out loud, so you do not have to watch the ring.
Run out of time and the table plays for you — it draws one card and ends your turn, exactly what you would do with nothing to play. Nobody is ever removed for being slow.
System players think for about five seconds and move — the clock is not for them.