Strangely, my current situation has dictated that I race latebreds every year. They race out to 165 miles fairly successfully, return wise. Started with 18 last year and ended with 12. Similar the previous year. Last year the previous ones went to 280 miles with 3 / 3 and some others that didn't go as far, probably around 6 or 7 all out to 200 miles. Just have to take them a bit slower, but some of that is down to my setup and allowable time.