24 namespace OPL::Statistics {
 
   33     enum class TimeFrame {AllTime, CalendarYear, Rolling12Months, Rolling28Days};
 
   35     enum class ToLdg {Takeoff, Landing};
 
   37     int totalTime(TimeFrame time_frame);
 
   39     QVector<QVariant> countTakeOffLanding(
int days = 90);
 
   41     QDate currencyTakeOffLandingExpiry(
int expiration_days = 90);
 
   43     QVector<QPair<QString, QString>> totals();