William R. Berkley’s last earnings conference call as chief executive officer of the company that bears his name lasted just over 20 minutes, with a lack of questions about a less-eventful quarter than competitors keeping it shorter than most. “I thank Mike McGavick for that,” Berkley quipped, referring to the CEO of XL Catlin and the fact that XL Catlin’s third-quarter earnings calls was scheduled for the same day and time as the Berkley conference on Monday evening.