But you know going by logic if it's multiple barriers and it took Ichigo 12 hours to get through them then the first couple of barriers should have already been closed off.

I'm not good at maths so I'll leave it to someone else to work out the formula, but the questions is: If each barrier stays open for 100 minutes and Ichigo went through 72 barriers in 12 hours (give or take a few hours) how many barriers are left open?

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