As U.S. Cardinal Robert Prevost realized during the secret conclave that he might be elected the next Catholic pope, he put his head in his hands at the daunting prospect of leading the 1.4-billion-member Church,

Voting will take place in the Sistine Chapel, with ballots continuing in succession until any candidate secures two-thirds of the available votes. If no clear choice has emerged after three days, balloting is suspended for 24 hours to allow cardinal electors time to reflect.