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Definition from buildingSMART: An element quantity that defines a time measure to provide an property of time related to an element. It is normally given by the recipe information of the element under the specific measure rules given by a method of measurement.

EXAMPLE: The amount of time needed to pour concrete for a wall is given as a time quantity for the labor part of the recipe information.

HISTORY New entity in Release IFC 2x Edition 2

EXPRESS specification:

ENTITY IfcQuantityTime
SUBTYPE OF ( IfcPhysicalSimpleQuantity);
TimeValue  :  IfcTimeMeasure;
WR21  :  NOT(EXISTS(SELF\IfcPhysicalSimpleQuantity.Unit)) OR (SELF\IfcPhysicalSimpleQuantity.Unit.UnitType = IfcUnitEnum.TIMEUNIT);
WR22  :  TimeValue >= 0.;

Attribute definitions:

TimeValue  :  Time measure value of this quantity.

Formal Propositions:

WR21  :  If a unit is given, the unit type shall be time unit.
WR22  :  A valid weight quantity shall be greater than or equal to zero.

Inheritance graph

ENTITY IfcQuantityTime;
ENTITY IfcPhysicalQuantity;
Name  :  IfcLabel;
Description  :  OPTIONAL IfcText;
PartOfComplex  :  SET [0:1] OF IfcPhysicalComplexQuantity FOR HasQuantities;
ENTITY IfcPhysicalSimpleQuantity;
Unit  :  OPTIONAL IfcNamedUnit;
ENTITY IfcQuantityTime;
TimeValue  :  IfcTimeMeasure;