Under the newly-implemented Home Affordable Foreclosure Alternatives Program (HAFA), the borrower/Realtor --owner of the property to be sold -- must convey a request for Approval of Short Sale (RASS) within 3 days. The servicer must accept, deny or counter within 10 days.
That's not how long it will take to close the deal; only the timeline in which a lender is supposed to respond to there being a short sale on the table. The lender must respond to their client, or the seller; not the buyer. Having said that, the seller's Realtor will assuredly notify the buyer's Realtor as soon as the lender responds.