If I leave home at 4 pm, when will I get to the airport?
[IN:GET_ESTIMATED_ARRIVAL If I leave [SL:SOURCE [IN:GET_LOCATION_HOME home ] ] [SL:DATE_TIME_DEPARTURE at 4 pm ] , when will I get to [SL:DESTINATION [IN:GET_LOCATION [SL:CATEGORY_LOCATION the airport ] ] ] ? ]