How long does a female BP take to become breedable?

I know the minumun weight is 1500g, but how long does it take them to get there? I see alot of "by second winter" around the forum, but for someone new like me, that doesnt mean alot. I know every snake grows at a different rate, but whats a good ball park figure?

How many months? years?

So many questions, so little time!

Thanks