The Details button on the toolbar of the Process Assembly, Process Monitoring and Administration perspective opens a pane that provides detailed information on the selected object, task, process, etc. This information is summarized in collapsible sections. If you select multiple items at the same time, the Details pane indicates the number of items you have selected.
In the Process Assembly perspective, in the case of non-executable objects, the value displayed in the Runtime section is always 0:00:00 hh:mm:ss. Otherwise, it shows the estimated runtime.