Identifing number of queries using druid in a specific time interval

Hello all.

We are using druid, and we want to be able to identify the amount of queries done by users in a time interval.

We need how many queries was done on druid in a specific time interval ( F.E : last hour )

FYI - We are using pivot as well.

Clarification - By query we mean : Every query that is done actively by a user on the pivot. ( Including drag & Drop, Filter and etc. ) .

We do not relate to the subqueries created in order to deliver the user the results, But to the queries the end user has requested.