@java.lang.Override
      public boolean hasValidUntilDuration() {
        return startTimingConstraintsCase_ == 1;
      }
<pre>
A relative time after which resources should not be created.
If the request cannot be fulfilled by this time the request will be
failed.
</pre>

<code>.google.protobuf.Duration valid_until_duration = 1;</code>

@return Whether the validUntilDuration field is set.
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/QueuedResource.java