That's a very general question to answer well without knowing which point product is in use, and if we're talking about on-access or on-demand scans.
Anyway, assuming VSE 8.8:
On-access timeout value is found in the On-Access General Policy. Default=45 seconds.
On-demand timeout is not explicitly defined, but performance is controlled in the client scan task - performance tab.
Both mirror the options avaiable in the local product interface.