public Builder clearMinDuration() {
        bitField0_ = (bitField0_ & ~0x00000001);
        minDuration_ = null;
        if (minDurationBuilder_ != null) {
          minDurationBuilder_.dispose();
          minDurationBuilder_ = null;
        }
        onChanged();
        return this;
      }
<pre>
Optional. Defines the minimum duration of the guarantee. If specified,
the requested resources will only be provisioned if they can be
allocated for at least the given duration.
</pre>

<code>.google.protobuf.Duration min_duration = 1 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/QueuedResource.java