AWS SDK for .NET Documentation
HeartbeatTimeout Property
AmazonAmazon.SimpleWorkflow.ModelScheduleActivityTaskDecisionAttributesHeartbeatTimeout Did this page help you?   Yes   No    Tell us about it...
If set, specifies the maximum time before which a worker processing a task of this type must report progress by calling RecordActivityTaskHeartbeat. If the timeout is exceeded, the activity task is automatically timed out. If the worker subsequently attempts to record a heartbeat or returns a result, it will be ignored. This overrides the default heartbeat timeout specified when registering the activity type using RegisterActivityType. The valid values are integers greater than or equal to 0. An integer value can be used to specify the duration in seconds while NONE can be used to specify unlimited duration.

Constraints:

Length
0 - 8

Declaration Syntax
C#
public string HeartbeatTimeout { get; set; }

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)