Experts say Groupon Inc. will not have its IPO ready for public trade until late summer or maybe even the fall. Groupon w ants to get IPO underway with the sudden surge of Internet firms debuting within the last few weeks, like LinkedIn (NYSE:LNKD) Corp. on May 19 and Pandora Media Inc.'s (NYSE:P) debut Wednesday.Pandora shares closed at $17.42 which was above its $16 IPO, but below its $20 opening price. LinkedIn has fallen about 10% since its May 19 opening. LinkedIn opened at $83 when its IPO price was $45 a share.New York-based partner of White & Case LLP Kevin Keogh said it will "likely take Groupon about 60 days from the time of its initial IPO filing to having it priced and to market." Groupon filed its registration on June 2. The registration is for an IPO, which Groupon expects to raise up to $750 million with.