CNN’s town hall about climate change will feature 10 Democratic presidential candidates and last seven hours.

The network revealed the format for its Sept. 4 town hall on Tuesday. The event, which is scheduled to last from 5 p.m. to after 11 p.m., will consist of CNN hosts moderating a town hall discussion with each individual candidate for 40 minutes at a time. CNN chief climate correspondent Bill Weir will question the candidates throughout the evening, as well.