  It takes a mallard duck 28-30 days for the eggs to hatch. All of the eggs will hatch within 24 hours and they will then head for water.Never to return to the nest. 3 people found this useful. It takes a mallard duck 28-30 days for the eggs to hatch. All of the eggs will hatch within 24 hours and they will then head for water. Never to return to the nest. 3 people found this useful.
The two main causes of strokes are termed ischemic and hemorrhagic and involve blood vessels in the brain. Ischemic strokes comprise about 80% to 85% of all strokes. With an ischemic stroke, a blood vessel in the brain becomes clogged with a clot just like the clogged arteries in the heart. With a hemorrhagic stroke, a blood vessel in the brain actually bursts or leaks. Hemorrhagic strokes tend to be more serious.
Hemorrhagic stroke is most often due to high blood pressure, which stresses the artery walls until they break. Other causes of hemorrhagic stroke include: Aneurysms, which create a weak spot in an artery wall, which can eventually burst.