The Democratic presidential candidates debate in Houston will be the longest yet, ABC News announced on Thursday.

The Sept. 12 showdown at Texas Southern University will run from 7 p.m. to 10 p.m. and will have half as many candidates as the previous two presidential debates.

ABC News confirmed that just 10 candidates will be part of the debate, down from the 20 in the last two rounds of debates.

Former Vice President Joe Biden, New Jersey Sen. Cory Booker, South Bend, Ind., Mayor Pete Buttigieg, Former Housing and Urban Development Secretary Julián Castro, California Sen. Kamala Harris, Minnesota Sen. Amy Klobuchar, former Texas Rep. Beto O'Rourke, Vermont Sen. Bernie Sanders, Massachusetts Sen. Elizabeth Warren and entrepreneur Andrew Yang all qualified for the debate.

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Candidates will get an opening statement and have one minute and 15 seconds to respond to questions, but 45 seconds for any rebuttals.

More Information What: Democratic Presidential Debates Where: Houston When: 7 to 10 pm Central Time on Sept. 12 Who Qualified: Joe Biden, Cory Booker, Pete Buttigieg, Julián Castro, Kamala Harris, Amy Klobuchar, Beto O’Rourke, Bernie Sanders, Elizabeth Warren, Andrew Yang. Who missed the cut: Bill de Blasio, John Delaney, Tulsi Gabbard, Tim Ryan, Michael Bennet, Kirsten Gillibrand, Marianne Williamson, Tom Steyer, Steve Bullock. Watch: ABC and Univision Moderators: Chief Anchor George Stephanopoulos, “World News Tonight” Anchor and Managing Editor David Muir, ABC News Correspondent Linsey Davis and Univision Anchor Jorge Ramos will moderate the debate. Format: Candidates will have 1 minute and 15 seconds to answer questions and 45 seconds to respond to follow-ups. There will be opening statements, but candidates will have no closing remarks. Next debate: October. Location and date still to be announced

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Chief Anchor George Stephanopoulos, “World News Tonight” Anchor and Managing Editor David Muir, ABC News Correspondent Linsey Davis and Univision Anchor Jorge Ramos will moderate the debate.

In the first debate in Miami in June, candidates debated for two hours. In Detroit in July, candidates had two hours and 30 minutes.