public Builder mergeRepeatInterval(com.google.protobuf.Duration value) {
        if (repeatIntervalBuilder_ == null) {
          if (((bitField0_ & 0x00000010) != 0)
              && repeatInterval_ != null
              && repeatInterval_ != com.google.protobuf.Duration.getDefaultInstance()) {
            getRepeatIntervalBuilder().mergeFrom(value);
          } else {
            repeatInterval_ = value;
          }
        } else {
          repeatIntervalBuilder_.mergeFrom(value);
        }
        if (repeatInterval_ != null) {
          bitField0_ |= 0x00000010;
          onChanged();
        }
        return this;
      }
<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