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By Monica Alba

Hillary Clinton has hunkered down at a hotel near her home in New York to prepare for the first presidential debate, according to sources familiar with the practice sessions.

The Democratic candidate was spotted leaving the hotel property Saturday afternoon to take a break — but her motorcade later returned to the site for a lengthy session stretching into the night.

The vehicles did not make it back to Clinton's house in Chappaqua until close to midnight, capping the latest in what has been at least two day-long sessions with top aides and advisers.

The candidate is expected to do additional preparation work on Sunday before meeting with Israeli Prime Minister Benjamin Netanyahu.

Related: Meet the Man Role-Playing Trump for Clinton's Debate Prep

Her staffers John Podesta, Jake Sullivan and Huma Abedin have been present throughout the sessions — as have debate coaches Ron Klain and Karen Dunn, who are each helping oversee the process.

Longtime aide and confidant Philippe Reines — who sources confirmed to NBC News was tapped to play Republican rival Donald Trump — also attended.

Since the campaign abruptly canceled a weekend trip to Charlotte, North Carolina, on Friday following days of unrest, it is now expected that Clinton will have more time to prep and will continue to use the hotel site as a practice location before Monday's prime time showdown.

Follow NBC News' latest presidential debate coverage here

NBC News' Lester Holt will moderate the event from Hofstra University on Long Island.