Finding A Buyer for A Short Sale

[M S]

So Im still new to real estate investing and been looking at this short sale investing angle, i have been really focusing on wholesaling and working on my buyers list.If your using an Option contract and then negotiating the short sale price and then finding a buyer, with short sales taking so long to even find out if they are approved or not, what are you guys telling your buyers? Say I got a buyer in 30 days and I could still be 60 days out from getting short sale approval for the price, how do i work it out on the purchase contract for my buyer the unknown time for approval of the short sale?