Although I'm not certain, I don't believe SALT times out client connections. Are the timeouts causing problems or is this just something you noticed? Many client SOAP stacks have built-in timeouts to try and allow a connection to be reused, but not tie up a connection for long idle periods.
Oracle Tuxedo Chief Architect
SALT will keep a network timeout if no activity from the client connection. The default value is 5 minutes. You can change it if needed by this link http://edocs.bea.com/salt/docs20/admin/admin.html#wp1038031.