Once the snake is eating well so probably at least 3 meals. If the snake is an overly aggressive eater then maybe after 2 meals. People usually offer food after the snake has had its first shed. They dont usually eat before that bc they are still absorbing their yolks. I recently brought home two females from an expo. Their weights on arrival were 56grams and 78grams. They had taken a few meals fromthe breeder already and he said he was confident that theyd be fine since they were aggressive eaters. He was feeding them live. I brought them home and offered them both a f/t mouse, they both took them right away. As long as the snakes are eating fine i dont think it matters how big they are so much. Plus the breeder is a local who ive bought from before so if i had amy problems we knew i could call or bring them back up to him if they werent eating for me.