Yes.  Follow these instructions:

1.  Open the sshd_config file for editing.

For current models (Sonoma, Meridian II, Tycho II, RTM3205) open this file:

   /etc/ssh/sshd_config

For legacy models open this file:

   /etc/sshd_config

2.  Uncomment and edit the lines in sshd_config with ClientAliveInterval and ClientAliveCountMax settings as follows:

   ClientAliveInterval <session timeout in seconds>

   ClientAliveCountMax 0

3.  Don't forget to make the modified file persistent, by copying it to FLASH:

For current models (Sonoma, Meridian II, Tycho II, RTM3205):

   cp -p /etc/ssh/sshd_config /boot/etc/ssh

For legacy models:

   cp -p /etc/sshd_config /boot/etc/

4.  Reboot the unit using this command:

   reboot