From Catholic News Agency:
Beginning Thursday, the cardinals will hold four votes each day: two in the morning and two in the afternoon. Each round of votes is followed by smoke from the chimney, which will be black if still no agreement has been reached, or white if the new pontiff has been elected.
If the new pope is not elected on the first morning ballot, a second ballot is held immediately. Both ballots are burned together, leading to possible smoke around noon Rome time. If, however, the pope is elected on the first morning ballot, the white smoke will appear shortly after 10:30 a.m.
View this post on Instagram