The average amount of time between the creation of a topic, and it’s first reply by a mod

Hi all,

I’m trying to find out a certain statistic, but it's currently impossible within the exports/dashboards.

Idea: I want the average amount of time between the creation of a topic, and it’s first reply by a mod. As a Community manager or manager I think it's quite usefull to know how long it takes for mods to first respond on a topic (SLA). 

To me it doesn't sound to difficult to build within Exports or even better in the Dashboards, but what do I know…

Does anyone else think this would be a handy feature/statistic?