Three friends are planning a movie marathon. The first friend can watch a movie every 12 hours, the second friend every 20 hours, and the third friend every 30 hours. They want to know the least amount of time in hours it will take before they all can start watching a movie together. What is the least common multiple of 12, 20, and 30? Let's think step by step and output the final answer within \boxed{}.
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