Time for 'permanent' cookie to live in seconds. This is what is used when a user selects "save login". Default is the equivalent of 1 year (30000000).
Time to delay between page redirects (in seconds). Users can override this setting in their user preferences. Default is 2 seconds.
Time to wait before document is stale (in minutes). This is used in meta_inc.php. Default is 0 (expires right away).
This timeout is used by pages which does time consuming operations like upgrading the database. The default value of 0 disables timeout. Note that this timeout is specified in seconds.