Buyer Insisting on THIRD walk through

[Account Closed]

The buyers of our house are threatening to delay our closing time if they don't get to come in for a SECOND final walk through.
Buyers—first time home buyers. Conducted inspection one day. Sewer inspection another day. Insisted on coming in after a big storm a few weeks later to confirm no water damage (even though we sent photos). Then schedule their "FINAL walkthrough" two weeks prior to closing.

Sellers—agreed to make NO repairs after inspection, but agreed to pay $1,000 at closing to buyers for repairs to be made (on a $119,000 house that had just been fully renovated). 

This was a 60-day closing. NOW it's two business days before closing and they are threatening to delay closing to the afternoon unless they get to walk through again, because "the husband was out of town" on the first "final walkthrough." But no one forced them to do their final walk through then. We (the sellers) are SUPER busy with buying our other home and packing and don't have time to let them come in for the FIFTH time after they signed the PA.

Can they even DO this? They don't take possession until 24-hours after closing, so delaying the closing just delays their possession. I don't understand. It messes up our entire schedule with movers and flooring contractors if they delay our closing because we can't close on our next house until AFTER closing on our current house.