According to The Guinness Book of Records the largest chocolate Easter Egg went on display at Le Acciaierie Shopping Centre, in Cortenuova, Italy, on 2011.
Egg Weight = 7,200 kg = 15,873 lbs
Height = 10 m = 34 ft
Circumference = 19.6 m = 64 ft
The sugar content for easter eggs is: 55-65% by weight
So we will assume the sugar content of the giant egg was in the middle: