Conclave live: black smoke emerges from chimney as cardinals fail to agree on new pope

Signal from Sistine Chapel chimney shows deliberations will continue over new leader of the Catholic church

Historically, some of the conclaves were really drawn out: in 13th century, they needed three years, over 1,000 days, to choose Gregory X.

There was also one that ended on the first day, when Julius II in 1503 was elected after just 10 hours.