public com.google.protobuf.Timestamp getExpireTime() {
      if (expireTimeBuilder_ == null) {
        return expireTime_ == null
            ? com.google.protobuf.Timestamp.getDefaultInstance()
            : expireTime_;
      } else {
        return expireTimeBuilder_.getMessage();
      }
    }
<pre>
Output only. The time at which this resource will be purged.
</pre>

<code>
.google.protobuf.Timestamp expire_time = 9 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>

@return The expireTime.
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/CustomClass.java