I believe it just depends on the individual snake. I have had some females reach the 1000 gram mark at 1 year and others still sitting at 350-450 grams. Males same thing. I have one 8 year old female who to this day has never got much bigger than 1250 grams. She will just go on a lengthy fast from time to time. I finally bred her two years ago and she gave me a small clutch. She eats better now but still is not overly large for a female. I do agree with what was said about weekly feeding and it not representing the snakes natural feeding habits. However, in captivity it is accepted as the norm. I myself feed my adults once every 7-10 days. If they refuse they wait until the next time everyone is offered. So they will from time to time go several weeks without a meal.