Every ten minutes during sunset, the sky changes to a new color. How many colors did the sky turn over the two hours of a long summer sunset if each hour is sixty minutes long? Give me reasons, before answering the question

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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At 60 minutes per hour, the sunset was 2 * 60 = 120 minutes long. The sky changes color every 10 minutes, so it turned 120 / 10 = 12 colors over the summer sunset. So the final answer is 12.