An online auction for the right to dine with billionaire investor Warren Buffett and raise money for a San Francisco charity has started strongly, with the top bid surpassing $1 million in less than a day.

Buffett has raised $17.8 million in 15 prior annual auctions for Glide, a charity in San Francisco's Tenderloin district that provides food, health care, rehabilitation and other services for the poor and homeless.

As of 2:30 p.m. EDT (1830 GMT) Monday, the top bid was $1,000,100 in the eBay auction, which ends at 10:30 p.m. EDT Friday (0230 GMT Saturday).