How long will the conclave last?
A new pope could be elected as soon as the first ballot on Wednesday, or the process could continue for days. Since 1831, no conclave has lasted more than four days.
Up to four rounds of voting typically take place in a day. If no clear choice has emerged after three days, balloting is suspended for 24 hours to allow cardinal electors time to reflect. Another seven rounds of balloting then takes place, followed by another break, and so on.
If no pope is elected after 33 or 34 votes -- generally about 13 days -- then a new rule introduced by Pope Benedict XVI decrees the two leading candidates as determined by previous ballots will engage in a runoff vote. If the candidates are members of the conclave, they cannot vote in the runoff but are present for it. Whichever candidate receives the necessary two-thirds majority of the votes is the new pope.
Cardinal Jean-Paul Vesco, the archbishop of Algiers, told ABC News it would be "unexpected" if the conclave goes past Friday.