The top bid was $1 million as of 1 p.m. EDT on Monday, and had been made within two minutes of the auction's Sunday night launch.

Bids often surge near the end of the eBay auction, which concludes on Friday at 10:30 p.m. EDT.

Buffett, the chairman of Berkshire Hathaway Inc, has raised $23.6 million in 17 years of auctions for Glide.

That included $3,456,789 from last year's winner, a woman who chose to remain anonymous, tying a record set in 2012.

Other winners have included Ted Weschler, a hedge fund manager who paid $5.25 million to win two auctions and later became one of Buffett's investing deputies at Berkshire.

Glide uses its $18 million annual budget to provide more than 750,000 free meals, emergency shelter for 8,500 people, 2,600 HIV and Hepatitis C tests and day care and after school programs for nearly 450 children.

Located in San Francisco's Tenderloin district, Glide was co-founded and is led by the Rev. Cecil Williams, the 87-year-old pastor emeritus of the affiliated Glide Memorial United Methodist Church, and his wife Janice Mirikitani.

Buffett got involved with Glide after his first wife, Susan, became a volunteer, and continued after her 2004 death. He remarried in 2006.

He is also donating virtually all of his wealth to several charities. Forbes magazine on Monday estimated his net worth at $74.9 billion.

Buffett will dine with the auction winner and up to seven guests at the Smith & Wollensky steak house in Manhattan. He has said all topics are fair game except where he will invest next.

According to Glide, these bidders won its past auctions:

2000: Pete Budlong, $25,000

2001: Jim Halperin and Scott Tilson, $20,000

2002: Jim Halperin and Scott Tilson, $25,000

2003: David Einhorn, Greenlight Capital, $250,100

2004: Jason Choo, Singapore, $202,100

2005: Anonymous, $351,100

2006: Yongping Duan, California, $620,100

2007: Mohnish Pabrai, Guy Spier, Harina Kapoor, $650,100

2008: Zhao Danyang, Pure Heart Asset Management, China, $2,110,100

2009: Courtenay Wolfe, Salida Capital, Canada, $1,680,300

2010: Ted Weschler, $2,626,311

2011: Ted Weschler, $2,626,411

2012: Anonymous, $3,456,789

2013: Anonymous, $1,000,100

2014: Andy Chua, Singapore, $2,166,766

2015: Zhu Ye, Dalian Zeus Entertainment Co, China, $2,345,678

2016: Anonymous, $3,456,789

(Reporting by Jonathan Stempel in New York; Editing by Dan Grebler)

By Jonathan Stempel