At CNN Money, Gregory Wallace reports: "Black Friday doorbusters begin as early as 6 a.m. the morning of Thanksgiving day, when Kmart opens. You can shop there any time until the real Black Friday is over -- it's open for 42 hours and finally closes at midnight on Saturday. Like Kmart, a growing number of retailers are starting Black Friday a day early. This year, Radio Shack joins the list with an 8 a.m. opening, though most -- the likes of Macy's, Best Buy, Target, Kohl's, Toys R Us, J.C. Penney and Sears -- still wait until after dinner is served. Walmart, the nation's largest retailer, will keep most locations open around the clock -- as usual -- but begins the Black Friday sale specials at 6 p.m. on Thursday." More here.