About 3 per minute
Iceland sits on a volcanic hotspot in the Mid-Atlantic Ridge and has relatively frequent eruptions, though most occur in sparsely populated areas and pose little danger to people or property. The...
Often considering only 2 are still active, normally they erupt after earthquakes
There is no fixed length to an erruption, it varies from volcano to volcano. a volcano can erupt in days or more than its depend on its manner .
Small eruptions every 20-40 minutes, large eruptions 2-20 years.