OpenGoo does not currently set Session timeout, it uses the default from the server (PHP's default is 24 minutes).
There are two ways to change the default behaviour to a two hours timeout :
1.- If you can access a working .htaccess in your root OpenGoo directory (common in Linux), you should add the following lines:
php_value session.gc_maxlifetime 7200
php_value session.gc_divisor 1
php_value session.gc_probability 1
2.-The second (untested) option is to add the following code into OpenGoo (in OPENGOO_ROOT/environment/environment.php after the comment "//Configure PHP", line 13 aprox)
ini_set( session.gc_maxlifetime, 7200);
ini_set( session.gc_divisor, 1);
ini_set( session.gc_probability, 1);
Hope it is usefull,
Marcos