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It would depend on the weather -- for instance, if it's raining all the time, cardboard sandals/flip flops wouldn't last too long. Also, the type of terrain you are walking on will have impact, and if you're a hiker, you'd probably chew through a cardboard insole very quickly. That said, durable cardboard would last longer than a weaker or flimsier type, so if you need the insole to last longer, choose good quality cardboard.
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