Specifies the maximum acceptable additional delay to the typical transport delay from the time the data is written until the data is delivered at the DataReader and the application is notified of this fact.

Attributes

Value	Meaning	Concerns	RxO	Changeable
A duration: duration	Specifies the maximum acceptable delay from the time the data is written until the data is inserted in the receiver's application-cache and the receiving application is notified of the fact. This policy is a hint to the Service, not something that must be monitored or enforced. The Service is not required to track or alert the user of any violation. The default value of the duration is zero indicating that the delay should be minimised.	Topic, DataReader, DataWriter	Yes	Yes

This policy provides a means for the application to indicate to the middleware the “urgency” of the data-communication. By having a non-zero duration the Service can optimise its internal operation.

This policy is considered a hint. There is no specified mechanism as to how the service should take advantage of this hint.

The value offered is considered compatible with the value requested if and only if the inequality “offered duration <= requested duration” evaluates to ‘TRUE.’