public com.google.type.IntervalOrBuilder getIntervalOrBuilder() {
        if (intervalBuilder_ != null) {
          return intervalBuilder_.getMessageOrBuilder();
        } else {
          return interval_ == null ? com.google.type.Interval.getDefaultInstance() : interval_;
        }
      }
<pre>
The start and end time of the reservation.
</pre>

<code>.google.type.Interval interval = 4;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/Reservation.java