It really all depends on how the snake is eating. With males, getting them 500g in their first year is extremely likely as long as you have a good eater.
With females its a little harder to judge. Its not uncommon for a female to plateau at around 1000g for a while (I swear they turn into teenage girls trying to watch their figure). How quickly they snap out of it will play a huge role in how fast they hit 1500g. There are also girls who never stop eating around 1000g, those will naturally hit size sooner.
You also have to take into account genetics of the snake. I have a 6 year old proven breeder female pewter that is barely 1400g (I think she hit 1500g once when gravid). Shes given me 6 good eggs almost every year and is at a healthy weight for her size, shes just a small girl. I also have a couple girls who are on the large size (they were over 2000g at 2 years) who probably hit 1500g in 18 months but it was all length. They needed another year to fill out before I was comfortable breeding them even though they were technically to size.
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