The White House wants North Korean leader Kim Jong Un to commit to a timetable to surrender his country’s nuclear arsenal when he meets President Donald Trump next week in Singapore, a high-stakes summit that could last as long as two days — or just minutes.

Trump has been advised not to offer Kim any concessions, as the White House seeks to put the onus on the North Koreans to make the summit a success, one U.S. official said. The president is determined to walk out of the meeting if it doesn’t go well, two officials said. Alternatively, Trump is toying with the idea of offering Kim a follow-up summit at his Mar-a-Lago resort in Palm Beach, Florida — perhaps in the fall — if the two men hit it off.

Other than announcing that the two leaders will first meet at 9 a.m. Singapore time June 12 at the Capella Hotel on Singapore’s Sentosa Island, the White House has described no schedule for the summit. If the first meeting goes well, there will be further events that day and perhaps even on June 13.