12? maybe you mean 1/12th. and scratch my idea because i misread his question. i thought that every two minutes it would globally check and replace not individually

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Oh yeah, my mistake 12 times a second not once every 12.
Also the hard part is making the timmer differant for each one. Because say one minute after picking up one you could pick up another. The second needs to respawn 2 minutes later but not at the same time the first is replaced.
I belive he figured out how to do this or took the long way out however.