In Zoho Projects, the client users can log work hours in timesheets and track the time spent on tasks and issues. This permission can be enabled only by the portal owner or the admin.

For instance, If the administrator wants a client user to add the time log for a particular task, the admin can create a custom client user profile under Profiles --> Manage users and assign it to the client user. The client user will now be able to view, add, edit and delete the timesheet module. However the users assigned to the default client profile will not be able to access the global timesheet. Learn more about timesheet permissions.

Note:

This feature is available in the user based Enterprise plan of Zoho Projects.