There is no average, depends on various factors weight right out of the egg(while the hatch at about 55/75 grams you have exception, I had a 24 grams hatchling this year), how fast the animal got started (some will eat within a few days after their first shed, some might take 4 or 6 weeks), feeding frequency, prey size etc.
The most important is that the animal looks healthy and of a good body weight, in other words well proportionate.
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