If John leaves his house now - how long will it take him to get here?
[IN:GET_ESTIMATED_DURATION If [SL:SOURCE [IN:GET_LOCATION_HOME [SL:CONTACT John ] leaves his house ] ] [SL:DATE_TIME_DEPARTURE now ] - how long will it take him to get [SL:DESTINATION [IN:GET_LOCATION [SL:LOCATION_USER here ] ] ] ? ]