https://learn.microsoft.com/en-us/dotnet/api/system.threading.waithandle.waittimeout?view=netframework-4.7.2
WaitHandle.WaitTimeout Field (System.Threading) | Microsoft Learn
Indicates that a WaitAny(WaitHandle[], Int32, Boolean) operation timed out before any of the wait handles were signaled. This field is constant.
field systemthreadingmicrosoftlearn