Read this: As of 18 June 2012, the ECB in total had spent 212.1bn (equal to 2.2% of the Eurozone GDP) for bond purchases covering outright debt, as part of its Securities Markets Programme (SMP) running since May 2010. On 6 September 2012, the ECB announced a new plan for buying bonds from eurozone countries. The duration of the previous SMP was temporary, while the Outright Monetary Transactions (OMT) programme has no ex-ante time or size limit. On 4 September 2014, the bank went further by announcing it would buy bonds and other debt instruments primarily from banks in a bid to boost the availability of credit for businesses.

How long was the duration of the Securities Markets Programme to last?
What is the answer? (If it cannot be answered, return "unanswerable")
temporary