Unverified50% confidenceFactExact time
End-to-end latency is defined as the time "from when the user finishes their last utterance to when they hear the returned audio"; about 1.5 seconds is the threshold at which users stop actively complaining about speed, and pushing it further to around 1.2 seconds makes conversation more natural, but below 1 second it may feel eerie.
1
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50%
Confidence
Long-term
Relevance
10/29/2026
First Seen
Sources
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Related Claims
VerifiedThe industry-recognized threshold for natural conversation is an end-to-end latency of 500 milliseconds or less; beyond this threshold, users will noticeably perceive a pause.79% similarUnverifiedEnd-to-end models have reduced average latency in speech translation from the 2–3 seconds of traditional pipelines to approximately 300 milliseconds.78% similarUnverifiedStreaming output can reduce the user-perceived time-to-first-token from several seconds down to the millisecond level.76% similar
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