What is the timeout for a SSH session on a PortServer TS 4

What is the timeout for a SSH session on a PortServer TS 4
also does anybody know how to change it?

Thank you

I forgot to add a detail…

while connected to a serial port via ssh,
I was talking to a vendor and the session timed out before I returned.

Had to reconnect to the terminal server to continue work on the serial device