public Tuple <double, double> TotalTime() { return(new Tuple <double, double>( Configurations.Aggregate(0.0, (i, s) => i + (s.Result == null ? 0.0 : s.Result.Time1)), Configurations.Aggregate(0.0, (i, s) => i + (s.Result == null ? 0.0 : s.Result.Time2)) )); }