The most pressing question that Donald J. Trump could face next week in the first debate of the 2016 presidential race may not be about Iran or immigration, but this: Can he deploy enough adjectives, superlatives and invectives for him to use up his time without being challenged successfully on the substance of policy?

“I have great regard for many of the nominees,” Mr. Trump said in an interview.

No candidate is more prone to wing it than the mercurial Mr. Trump.

He will probably arrive in Cleveland ready with cutting “Observations” about all of his rivals, based on a person briefed on Mr. Trump’s debate preparations who was not authorized to speak publicly.

In a 90-minute debate with 10 candidates, Mr. Trump’s speaking time is unlikely to reach 10 minutes, even with rebuttals, leaving little time for him to delve into policy details.

“I believe for Donald Trump, a tedious debate would probably help.”

Brett O’Donnell, who’s coaching Mr. Graham on debate skills, guessed that if Mr. Trump dissed his competitions incessantly or indiscriminately, he could alienate audience.

“Among The other nominees needs to be the one to get that moment of weakness happen for Trump. It is like the big-talking bully who goes around the neighborhood about how he is the toughest kid on the block, popping off. Kick his tail fair and square in front of everyone, and you possess the neighborhood.”

GOP Debate