xome.com short sale bank deadline

[Mark Rogers]

I was the high bidder on xome.com on a short sale property.  The terms say:

Final offer subject to Seller’s approval, which shall be given or denied at Seller's sole and absolute discretion; Seller has fifteen (15) calendar days to make this determination.

We're now at day 25, the status on xome.com still says "Offer Under Review", and the agent has been unable to get any response from the bank.  

Has anyone had a similar experience on xome.com, and if so, how did it end up playing out?  About how long did it take you to hear back on a high bid in a short sale situation if it wasn't accepted immediately?  Thanks!