expireTime

You can specify a custom stale-while-revalidate expire time for CDNs to consume in the Cache-Control header for ISR enabled pages.

Open next.config.js and add the expireTime config:

module.exports = {
  // one hour in seconds
  expireTime: 3600,
}

Now when sending the Cache-Control header the expire time will be calculated depending on the specific revalidate period.

For example, if you have a revalidate of 15 minutes on a path and the expire time is one hour the generated Cache-Control header will be s-maxage=900, stale-while-revalidate=2700 so that it can stay stale for 15 minutes less than the configured expire time.