If you really like the house will be worth the wait but you have to be willing to be patient. That's the key to short sales. If you want to get a deal you have to be able to wait it out.
Best of luck,
But basically it depends on whether the seller already has all their financials and paperwork into the lender and have been assigned a negotiator. From there a BPO (appraisal) needs to be ordered. There is a bunch of other stuff like how many lenders involved, MI company or not, etc... but you can expect 2-3 months on average.
And be ready for the long haul it can take 6 months from start-to-finish to complete a short sale.
They are under no obligation to respond, to be civil, to be considerate, nor humane. They will do what is in their best interests.
Incindentally; Where did those number come from? Surely not from Chase? How do they compare to the Market Value?