@java.lang.Override
    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
      if (((bitField0_ & 0x00000001) != 0)) {
        output.writeMessage(1, getScheduleStartDate());
      }
      if (((bitField0_ & 0x00000002) != 0)) {
        output.writeMessage(2, getScheduleEndDate());
      }
      if (((bitField0_ & 0x00000004) != 0)) {
        output.writeMessage(3, getStartTimeOfDay());
      }
      if (((bitField0_ & 0x00000008) != 0)) {
        output.writeMessage(4, getEndTimeOfDay());
      }
      if (((bitField0_ & 0x00000010) != 0)) {
        output.writeMessage(5, getRepeatInterval());
      }
      getUnknownFields().writeTo(output);
    }
<pre>
Interval between the start of each scheduled TransferOperation. If
unspecified, the default value is 24 hours. This value may not be less than
1 hour.
</pre>

<code>.google.protobuf.Duration repeat_interval = 5;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java