Mix sugar, soy sauce and Worcestershire sauce for marinade. Make marinade 4 days prior to baking.
Marinate chicken for 3 days.
On the 4th day, preheat oven to 475 degrees and remove marinated chicken from mixture and place in a covered baking dish. Reduce heat to 375 degrees and bake for 1 hour. Reduce heat to 275 and bake for another hour. Reduce heat to 175 and continue to bake an additional hour. Total baking time is 3 hours. Remove from oven and let rest for 45 minutes before serving.