Retrieve ALL tasks duration from user across projects in the organization

Retrieve ALL tasks duration from user across projects in the organization

Hello, 

I'm trying to get all the work duration time (hours by task) for users in the organization, I need to get a way to retrieve all the tasks duration, meaning, from all projects at once, currently I know there is the endpoint https://projectsapi.zoho.com/restapi/portal/[portal_id]/projects/[projectID]/tasks but this requires a project ID, is there a way to get the work hours per user per week? 

I am also not talking about the timesheets because that works more as a log than as a scheduled time to complete tasks