Question SQL Sentry Condition Time base Ruleset : what exactly "Process Action After" and "Process Subsequent Action After"

We have an Advisory Condition "High CPU", which ruleset: Time based.

Action: Send Email ( when CPU over 90 % )

Process Action After: 3 minutes
Process Subsequent Actions Every: 30 minutes.

There are some points we are not very clear about above ruleset, especially on "Process Subsequent Action Every", would this set "overrides" after 3 minutes rule?