A cyclist travels at a constant speed of 15 miles per hour. On a particular day, she starts her journey at 8:00 a.m. and reaches her destination at 10:00 a.m. On another day, she travels the same distance but at a speed of 12 miles per hour. How much longer does it take her to reach her destination compared to the first day? Let's think step by step and output the final answer within \boxed{}.
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