D20: "Infinity" or "eternity" instead of "999" or "9999" etc.!
One should better explicitly distinguish, whether one wants to do a very high number of repetitions or loop iterations, or want to run an infinite number of repetitions (i.e. "until somebody comes in, checks and stops manually") or an infinite number of loop iterations (until either manual stop or rather a "break" condition fulfilled.
As in the issue reported previously, such a feature comes in handy as well when it comes to counting time estimations for the spy and the web spy!