The start date is set to pick a new pope. How long it will take remains anyone's guess. Catholic cardinals said Monday that their conclave to select Pope Francis' successor will begin on May 7, reports the AP. The cardinals delayed the secret voting for two days to allow more time for the approximately 130 cardinals who will participate to get to know one another—and perhaps find a consensus candidate—before they are sequestered in the Sistine Chapel.