We bought a resale recently. We signed papers in early January. The contract stated that the contract could not close until after May 4. We received our final papers in late April. We signed them and overnighted them back after we got a check from the bank. I think the closing agency received them on May 4th and closed the next day. The seller had already returned their paperwork.
It took Disney about a month to send us our e-mail welcoming us to
DVC. I checked back a week or so later to see if our points were showing. Our points were there and there were 132 extra points. Apparently the previous owner had 125 banked points from 2019 they didn't get to use. The biggest thing to keep in mind is that if both parties return their paperwork in a timely manner, it should close shortly after that.