Defined in github.com/aws/aws-sdk-go/service/swf/api.go
Optional. The default maximum duration, specified when registering the activity type, that a task of an activity type can wait before being assigned to a worker. You can override this default when scheduling a task through the ScheduleActivityTask decision.
The duration is specified in seconds; an integer greater than or equal to 0. The value "NONE" can be used to specify unlimited duration.