For Speech-to-Text, how long can API's streaming session remain open after inactivity period?

[GCarbajal]

In Google Cloud Speech-to-Text:

When no audio data (including silent audio) is being sent, the Google Cloud Speech API's streaming session remains open but inactive, waiting for new audio data to process.

How long can the API's streaming session remain open after some inactivity period?
10 seconds?

NB: this is different from VAD timeouts with streaming silence, where audio data representing silence is still being sent and processed to the API's streaming session.