Growth rates

Hey all, im relatively new to reptile keeping, currently got a couple month old corn snake but have my heart set on a royal/ball.

I have been trying to find out aproximate growth rates of royals but cant seem to find any good info anywhere.
I know size depends on individuals but for example. A male at a year would be aprox how long, at 2 years how long ets etc...

Also if housing a male in a 2ft long, 1,5ft wide viv at what age would he need to be moved into a 3/4ft viv?

Hoping someone can help as want to know as much as poss before buying.

im curious as well, someone please post something

My adults not really sure how much they grow. I do weigh them but never really checked to see how much they grow in say a month. My babies anything under a year gets fed every 5 days. If they eat at least 4 times a month I see an average of 100g a month. once they get older that does seam to slow down a bit.