20 minute recording limit on D4

Recording a wedding this weekend, used the D4 as my backup and B roll camera. Actually loved the video quality and thinking of using it as my primary camera next time.

The major obstacle to that is the 20 minute record time limit on 1080p. It means I can't capture an entire wedding ceremony without a break and rerecord in the middle which will loose a couple seconds.

Is there any menu setting or does a newer firmware eliminate to 20 minute time limit?