"Cronjob did taken X Minutes / Hours / Days"

Hey there,
short input: Would be nice if the Piwik-Backend shows -over the last X archivings- the average seconds / minutes it did taken to archive all the data.

Any ideas / feedbacks?

My Piwik-Log will be overwritten each archiving. But not all archivings calculates all periods, so I don’t know what was the last “big archiving”-processing-time. There grows the idea for this sugestion.