How can I automatically remove stored reports.

Is there a way to manually define the retention period for specfic stored reports ?

I see a stored reports clean up task under scheduled tasks, but not sure what exactly that does.

I have enabled custom dashboard that I have scheduled and stored, and I have enabled 'prefer stored report' in the report properties so that it loads quickly.

However I under Administration -> Stored Reports, all these reports are still retained for months. Is there a way I can limit their retention to a week or 10 days etc ?