Timeout.InfiniteTimeSpan

[NN---]

     [System.Runtime.InteropServices.ComVisible(false)]
     public static readonly TimeSpan InfiniteTimeSpan = new TimeSpan(0, 0, 0, 0, Timeout.Infinite);

https://docs.microsoft.com/en-us/dotnet/api/system.threading.timeout.infinitetimespan?view=netcore-2.2

[theraot]

NuGet 3.2.0.