How much would you pay for a private lunch with Bill and Hillary Clinton?

The Clinton Foundation is hoping to bring in at least $250,000 for the "once-in-a-lifetime opportunity" with an online auction ending May 29.

The winning bidder and a guest will be treated to between 45 minutes and an hour with the former president and former secretary of state and first lady, during a meal at the foundation's headquarters in New York City. The lunch, which also includes a photo with the Clintons, will be scheduled within a year of the auction.

This won't be the first time the Clintons have auctioned off their time. In 2012, Bill Clinton spent a day with a Houston woman who cast the winning bid, $255,000, in an auction benefiting the Clinton Foundation.

But the timing could make this lunch even more valuable: Hillary Clinton will release a memoir, "Hard Choices," later this year, and is currently weighing whether to run for president again in 2016. Should she run, polling suggests she would start the race as the prohibitive frontrunner.

The auction opened to bidders Monday and, as of this writing, nine bids have pushed the price to $44,500.