Hello @KV , Thanks for your patience.
PG team has confirmed that currently, the longest silence is 5000ms and do not support longer silence than this. In your case, we would suggest you edit the silence by yourself.
I hope this helps. Please let us know if you need more information.
Regards,
Vasavi
-Please kindly accept the answer and vote 'yes' if you feel helpful to support the community, thanks.