Sarah is designing a rectangular garden. She plans to use the garden for 4 hours each weekend: 2 hours on Saturday and 2 hours on Sunday. The length of the garden is 12 feet and the width is 8 feet. If she plants flowers in the garden at a rate of 1 square foot per minute, how many weekends will it take her to plant flowers in the entire garden? Let's think step by step and output the final answer within \boxed{}.
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