Other option is to calculate business duration. I did it using below script and report of the business duration field.

 Scheduled Job - Script

var gr = new GlideRecord("metric_instance");
gr.addEncodedQuery('end!=NULL^business_duration=NULL');
gr.autoSysFields(false); // so that the records don't have system updates
gr.query();
while(gr.next()) {
	var gsBusiness =new GlideSchedule('dcf6c8fedb5d7e007d1bfa0dbf9619db');
	// Get duration based on schedule
	gr.business_duration = gsBusiness.duration(gr.start.getGlideObject(), gr.end.getGlideObject());
	gr.setWorkflow(false); 
	gr.update();
}