populating time span in linq

var qDuration = from rowU in DataAccess.metadata.um_User
                                join rowLC in DataAccess.metadata.um_CallLog
                                on rowU.userID equals rowLC.userID
                                group rowLC by new { userID = rowLC.userID } into groupN
                                select new
                                {
                                    userID = groupN.Key.userID,
                                    noOfCalls = groupN.Count(),

                                    totDurationSec = (from row in groupN
                                                      select row.Duration.Seconds).Sum(),
                                    totDurationMin = (from row in groupN
                                                      select row.Duration.Minutes).Sum(),
                                    totDurationHours = (from row in groupN
                                                      select row.Duration.Hours).Sum(),
                                    
                                };

var qTime = new TimeSpan(1, 0, 0);
             string Dislay = qTime.ToString()