Bank has offered Dacien de Pago,but?

[jhamiltonsmythe]

I have a property valued prior to the recession at circa 469,000 euros.Currently I have it on the market for 169,000 but have yet to find a buyer.I have for the first time in fourteen years living in Spain fallen into arrears with the mortgage.Three years ago the bank put us onto calencia where we paid interest only.This period is now finished and my ex partner who is a joint mortgagee is refusing to sign to extend the calencia for a further three years in order to buy some time to sell the property for a realistic price rather than just give it away in a weak market.
My ex is now residing in the UK and I am continuing to live in the Spanish property.She has refused to contribute anything towards the mortgage for over a year now and with the ending of the calencia agreement my mortgage has now risen to a level I can no longer afford to pay.Its currently €1677 per month when before it was nearer €900.
The bank have e.mailed my ex partner on numerous occasions but she refuses to budge,and as I havnt been able to find a potential buyer so far,Im in a real fix.
I have had to find work in the UK as there is very little availability in Spain,and I work for three months at a time,followed by a months break back home in Spain.
The bank have recently offered me Dacien de Pago,which they claim my ex has agreed to sign,though I have no way of knowing as she has "disappeared" and doesnt communicate with me at all.(Her mother had apparently died last year and left her a considerable sum,and she evidently decided to start a new life without saying a word about it!)
My question is if I sign the Dacien de Pago how long do I have to vacate the property? All my possessions are in the Spanish property and I am currently working in the UK till the end of October on a contract which I am unable to break.The bank is pressurising me to sign the papers NOW,and Im obviously worried about the consequences of doing that.
Additionally if I DONT sign the Dacien en Pago,how long does a repossession typically take and what notice to vacate the property is given by the bank ? If the process is set in motion by the bank would I still be able to sell the property if a suitable buyer were found prior to a repossession reaching its conclusion?
Your advice would be appreciated.