If Apple CEO Tim Cook can raise more than $600,000 for a coffee date, how much would a lunch date with Yahoo CEO Marissa Mayer fetch? We'll find out for sure in about two weeks as the upbeat CEO is auctioning off a one hour lunch "experience" at the company's headquarters in Sunnyvale, California.

CharityBuzz is once again running the celebrity auction which put an estimated value of $25,000 on the date. There's still 15 days left in the auction and already the current bid is at $57,500 - money that will go towards the Aspire East Palo Alto Charter School, a K-6 public charter school that's dedicated to preparing all students for success in college and beyond.

The only question that remains really is, how high will the bidding go?

If you recall, an anonymous bidder recently shelled out a whopping $610,000 to have coffee with Tim Cook. That auction resulted in 86 total bids and was valued at just $50,000 by CharityBuzz. The winner was allowed to bring along one guest but all parties were required to sign a nondisclosure agreement and agree to a security screening.

The fine print on Mayer's auction notes that the auction is only valid for one person. The winning bid cannot be resold or reauctioned and it expires one year from the close of bidding. As with the previous auction, the winner will be subject to a security screening.

Any bets on how high the auction could go? Do you think a date with Mayer will bring more than a date with Cook?