There's a 1300-post thread on this same forum about it, if you have a few hours to kill. Avoiding infection is important, but really only an issue below 130F or so. As long as you have your wort in a sealed and sanitized container, you're okay to let it sit for a day. The other important point is hopping. Once the boil is over, you'll get minimal added bitterness, but hops kept at high temps will continue to contribute flavors and aromas. I throw most of my hops in after the boil and let them steep to simulate the whirlpool additions a lot of pro brewers use.