Calls Agregation Data Endpoint not returning the right value in allCalls timer

I'm making a call to the Calls Agregation Data Endpoint in the line of bussiness analytics API, I'm trying to get the total call time for each user with the all calls timer using "sum" aggregation type, but when I go to the RingCentral Analytics and Reporting in the Performance Report, I search all the calls a user made in a day and then request the same data with the aggregation data endpoint, but the value returned by the API is less than the total calls lenght shown in the Performance Report