AWS SDK for .NET Documentation
HeartbeatTimeout Property
AmazonAmazon.SimpleWorkflow.ModelActivityTaskScheduledEventAttributesHeartbeatTimeout Did this page help you?   Yes   No    Tell us about it...
The maximum time before which the worker processing this task 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 return a result, it will be ignored.

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)