public Builder setExpireTime(com.google.protobuf.Timestamp.Builder builderForValue) {
      if (expireTimeBuilder_ == null) {
        expireTime_ = builderForValue.build();
      } else {
        expireTimeBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Time at which the generated token will expire.
</pre>

<code>.google.protobuf.Timestamp expire_time = 2;</code>
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/GenerateAccessTokenResponse.java