Use the set command to display and set the timeout value:
Admin>
set
Preference Value Description
...
timeout 180 Network timeout, in seconds
...
Inst> set timeout 120
A minimum value of 120 seconds is recommended. The value of timeout is saved in the installation history database; when you find a value of timeout that works for your site, you can leave it permanently set (unless network conditions change and timeout errors begin to occur).