It also means that it will take time to close.
The process of a short sale, is more or less this:
Buyer writes and offer.
Seller accept the offer subject to Short Sale Approval.
Offer is sent to servicer/lender.bank
Bank recives the offer along with required documents from the seller, such as bank statement, tax returns, hardship letter and some other.
Bank request a Broker Price opinion. This is to get an estimate of how much is the property worth.
If there is an investor, all the package has to be sent to the investor for approval. Same if mortgage has Mortgage Insurance.
There are days between each step. Lets say 10 days for each, then you have 60 days. This is just an EXAMPLE it could take less or it could take more. Every lender has different ways to work.