John is organizing a marathon where runners will pass through several checkpoints. Each checkpoint is located at every square root mile from the starting line up to 50 miles. For example, the first checkpoint is at 1 mile (since \(\sqrt{1} = 1\)), the second checkpoint is at 4 miles (since \(\sqrt{4} = 2\)), and so on. How many checkpoints are there, and what is the furthest distance in miles a checkpoint can be from the starting line? Let's think step by step and output the final answer within \boxed{}.
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