15m (or less!) Apdex Calculation

Currently, APDEX is calculated every hour. This does not work in our business and we need a much finer calculation, preferably every 5 minutes, but would settle for 15 minutes. It goes back to having the dashboard provide tighter time periods as 12 hour minimum is very large. Would love to see last 15 minutes or such. I'd be happy to pay more for the service to facilitate the extra calculations.