It depends on the context. If you're trying to fire your gun in a video game, sure, it should respect every button press (subject to hardware debouncing which is always required). If you're submitting an online payment, a delay of 10 seconds per order is still not enough. If you're posting in a forum, duplicates should be automatically pruned.

Trying to pin down the number of milliseconds without context is a great example of bikeshedding.