Seems like the question of the day.

A good growth a good average growth is about 500 grams per year, for an animal that is fed approximately once a week.

Now some animals might be double that in a year and some might be less there are a lot of factor in play, weight out of the egg, how soon they eat on their own, genetics, food refusal, fast etc.
As for feeding they are often overfed not to the point of obesity but still are which usually translate later on in fast so if you want an animal that is healthy and eats with consistency here it is