The developer dashboard is an account-level view of your various premium subscriptions and their respective usage metrics.
For the premium Search API, you can view the total number of requests you’ve made this billing period, as well as the estimated requests you’ll make by the end of the current billing period. You can also view what percent of your request and Tweet allotment for the current billing period has already been consumed, and when you used your requests throughout the period. Actual Tweet volume delivered and projected for the period.
For the premium Account Activity API, you can view the number of subscriptions that you have used out of your total available subscriptions based on the tier. The volume delivered through Account Activity is not measured.
Using the drop-down menu in the top-left corner of the developer dashboard you can view request usage over different periods of time including the current month, the last 30 days, the last 24 hours, the last 120 minutes, and the past months. The developer dashboard and all request usage is based on UTC time.