public static com.google.webrisk.v1.SearchHashesResponse.ThreatHash getDefaultInstance() {
      return DEFAULT_INSTANCE;
    }
<pre>
The cache lifetime for the returned match. Clients must not cache this
response past this timestamp to avoid false positives.
</pre>

<code>.google.protobuf.Timestamp expire_time = 3;</code>
java-webrisk/proto-google-cloud-webrisk-v1/src/main/java/com/google/webrisk/v1/SearchHashesResponse.java