AWS SDK for .NET Documentation
WorkflowExecutionRetentionPeriodInDays Property
AmazonAmazon.SimpleWorkflow.ModelRegisterDomainRequestWorkflowExecutionRetentionPeriodInDays Did this page help you?   Yes   No    Tell us about it...
A duration (in days) for which the record (including the history) of workflow executions in this domain should be kept by the service. After the retention period, the workflow execution will not be available in the results of visibility calls. If you pass the value NONE then there is no expiration for workflow execution history (effectively an infinite retention period).

Constraints:

Length
1 - 8

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

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