Add missing serverside duration validation
Add missing serverside duration validation

ThiefMaster/indico,ThiefMaster/indico,indico/indico,DirkHoffmann/indico,DirkHoffmann/indico,pferreir/indico,pferreir/indico,indico/indico,DirkHoffmann/indico,pferreir/indico,ThiefMaster/indico,pferreir/indico,indico/indico,indico/indico,ThiefMaster/indico,DirkHoffmann/indico