Two-hour session limit applies regardless of in-flight lookups
Voice agent sessions expire after two hours; an in-flight function call does not extend the session, and the system emits MAXIMUM_SESSION_LENGTH_APPROACHING at 1h 55m and MAXIMUM_SESSION_LENGTH_REACHED at 2h.
Supporting evidence
Voice Agent Function Calling: Real-Time Data Lookup Guide
Original excerpt
Yes, at two hours, and an in-flight lookup won't hold the session open. You get a Warning with MAXIMUM_SESSION_LENGTH_APPROACHING at 1 hour 55 minutes, then an Error with MAXIMUM_SESSION_LENGTH_REACHED at the two-hour limit .
Context
KeepAlive doesn't extend it, and the docs don't cover a pending FunctionCallRequest at close. Finish or abandon it, then reconnect with agent.context .
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