Override this method to return the timeout value in milliseconds used by the DLL cache.
virtual DWORD GetDllCacheTimeout( ) throw( );
Returns the timeout value to be used by the DLL cache.
The default implementation of the method in this class returns ATL_DLL_CACHE_TIMEOUT.
The timeout value is the time between calls to IDllCache::Flush. If a DLL has not been used since the last call to Flush, it will be removed from the cache.