AWS SDK for .NET Documentation
ValidUntil Property
AmazonAmazon.EC2.ModelRequestSpotInstancesRequestValidUntil Did this page help you?   Yes   No    Tell us about it...
End date of the request. If this is a one-time request, the request remains active until all instances launch, the request expires, or the request is canceled. If the request is persistent, it remains active until it expires or is canceled. Default: Request remains open until criteria for closing are met
Declaration Syntax
C#
public string ValidUntil { get; set; }

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