Timely return of security deposit

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I have a tenant in Delaware who is requesting her security deposit at the time of her final walk through. What is the normal protocol for returning security deposits? Secondly, she paid for the month of May in full and the month to month lease ended on the 20th of May, is the rent prorated and is she required to receive prorated rent/the return of the excess payment. Lastly, she needs more time to clean the unit and get the rest of her belongings out, what is my obligation to her and should there be a charge for the extra days she needs to turn over the unit?