Had a thought, maybe someone here will know the answer -- has anyone trained a voice system on how long to wait before replying to an utterance? It occured to m

Had a thought, maybe someone here will know the answer -- has anyone trained a voice system on how long to wait before replying to an utterance? It occured to me that if your STT hears "hey how's it going" it should reply immediately, but if it hears "I've been thinking about <x>." then it'd be appropriate to wait a second or two in case there's more coming.