That is a great questions. But each person's loan is different. The time frame depends on the seller willing to cooperate and submit the appropriate docs in a timely manner through the short sale processor/negotiator. (All dependant upon who you are using for a Realtor and who they use to process their short sales). I was a short sale processor/negotiator and legal assistant for 6 years for a local law firm in St. Augustine. I am now a Realtor helping customers like yourself to understand how short sales work and their options when listing as a short sale.
Some banks can take over 90 days and some can take 3 months, there are so many variables that determine the length of time a short sale would take.
Feel free to contact me....firstname.lastname@example.org