Best of Luck!
If that is not the case, you need more answers from your agent and the listing agent.
The seller has to do their part with the bank, the bank has to do their part with the short sale approval, then you as buyer have to do your part. If either of the previous steps falters, you won't be doing yours and there will be no sale as offered.
If you have the short sale approval, and you are rolling on financing, then you should be able to close in 30 days, depending on the speed of your lender.
All the Best,
Jim Sweat, ABR, CRS, GRI, CDPE, e-PRO, ILHM
Do you have written acceptance of your offer from the seller AND the short sale lender(s)? If you don't have that yet, don't pay for your appraisal yet - wait until you know if your offer is accepted. Once your offer is accepted (in writing) by BOTH the seller and the lender(s), your purchase contract should state how many days after acceptance (by all parites and in writing) the deal will close.