Getty Images Enlarge Lewis Hamilton is aiming for a minimum of seven more years in Formula One and says there is no limit on what he can achieve now he's a two-time world champion. Hamilton's 11 victories in 2014 helped him clinch the title, ending a six-year wait for another championship and taking him into an elite group of multiple F1 champions. The 29-year-old is still yet to sign a contract extension at Mercedes beyond 2015, though talks resumed after Abu Dhabi, but he is under no doubts about how long he can stay in the sport. "I feel like I've got another seven years in F1," he told the BBC after winning the Sports Personality of the Year award on Sunday evening....
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