How Long Do The Speeches Usually Last?

How Long do the speeches usually last?

Today's speeches are:

USD Former Fed Chairman Greenspan Speaks http://www.forexfactory.com/images/m...act_medium.gif


http://www.forexfactory.com/images/m...dar_detail.gif USD Chicago Fed President Moskow Speaks http://www.forexfactory.com/images/m...impact_low.gif


http://www.forexfactory.com/images/m...dar_detail.gif USD Fed Chairman Bernanke Speaks