AWS SDK for .NET Documentation
StartToCloseTimeout Property
AmazonAmazon.SimpleWorkflow.ModelScheduleActivityTaskDecisionAttributesStartToCloseTimeout Did this page help you?   Yes   No    Tell us about it...
If set, specifies the maximum duration a worker may take to process this activity task. This overrides the default start-to-close 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.
Note:
A start-to-close timeout for this activity task must be specified either as a default for the activity type or through this field. If neither this field is set nor a default start-to-close timeout was specified at registration time then a fault will be returned.

Constraints:

Length
0 - 8

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

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