public Builder clearValidAfterDuration() {
        if (validAfterDurationBuilder_ == null) {
          if (startTimingConstraintsCase_ == 3) {
            startTimingConstraintsCase_ = 0;
            startTimingConstraints_ = null;
            onChanged();
          }
        } else {
          if (startTimingConstraintsCase_ == 3) {
            startTimingConstraintsCase_ = 0;
            startTimingConstraints_ = null;
          }
          validAfterDurationBuilder_.clear();
        }
        return this;
      }
<pre>
A relative time after which resources may be created.
</pre>

<code>.google.protobuf.Duration valid_after_duration = 3;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/QueuedResource.java