When users perform operations with domains and subdomains (such as
creating, removing, or changing their configurations), the changes take
effect only after the restart of Apache.
If you want to avoid too many Apache restarts, you can set a fixed
interval of time in which Plesk should restart Apache. Note that if the
interval is 0 seconds, Apache restarts immediately after each change. It
is recommended to always set this interval to more than 0 seconds,
especially if users perform a lot of operations with domains and
subdomains through Plesk.
If during the specified interval of time no changes were made with
domains, Apache will not restart.