Dear Christoph,
I am from the Job monitoring team. The minimum data collection frequency that you can set for the job monitoring object is 5 minutes. You cannot set lower than that.
But, i want to understand the requirement better so that i can answer the business requirement better.
Which is the metric you have configured? - Ideally you can use one of the several metrics supported - Cancellation or Job active .
Cancellation metric can be used for the job cancellation and the status of the jobs
Job active monitors the time of inactivity between two similar jobs.
Regards,
Mustameer