How long does a landlord have time wise (in Ohio) in returning our deposit. Another tenant will move in before the 30 days.?

we are moving out of the home we have lived in for 8 years. He has another tenant moving in right after we leave. I know by law he has 30days to return or deposit or reason why he is keeping it. but does that void after a new tenant moves in before that 30 days?
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