public com.google.type.Interval.Builder getIntervalBuilder() {
        bitField0_ |= 0x00000008;
        onChanged();
        return getIntervalFieldBuilder().getBuilder();
      }
<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