There is no accurate answer for how long it will take for dogs to develop symptoms after eating chocolate by mistake. This depends on the amount the dog eats, as well as the dog's physical fitness, whether the chocolate is authentic, if not much is eaten, and the size of the dog. It's very big, so they probably won't show symptoms of poisoning.

Tips:

Some dogs have not been poisoned after eating chocolate. It may be that the chocolate purchased by parents does not contain theobromine.