Non-standard container sizes can also be measured to give a TEU value for use in calculating statistics. Ports Australian stevedoring data are regularly published by BTCE for the five major Australian ports-Brisbane, Sydney, Melbourne, Adelaide and Fremantle. The measured rate at which containers are moved depends not only upon the number and size of containers moved but also on the time that cranes are able to work a ship. Elapsed time is the total time over which a ship is worked measured from first labour aboard to last labour ashore. Gross time is the elapsed time less the time that the ship is unable to be worked due to ship's fault, weather, awaiting cargo, industrial disputes, holidays or shifts not worked at the shipowner's request.
Net time is the gross time less award shift breaks.
There are two measuring units in general use that indicate waterfront productivity in terms of the throughput of containers. There are three measures based on calculating the number of TEUs per hour and used by the BTCE-the crane rate, the elapsed rate and the net rate. The crane rate is defined as the number of TEUs moved per net crane hour. The elapsed rate is the number of TEUs moved per elapsed hour regardless of the number of cranes working the ship. The net rate is the number of TEUs moved per net hour regardless of the number of cranes working the ship.