About how long will it take for my T to reach adult size?

[Sabeth]

She's a B. smithi, 6 years old with a 3" leg span. I know it's not possible to get a precise answer but any estimates? Thank you!

 

[Nada]

with Brachypelma, 1" per year is about the closest to accurate as you can get, but by no means is that at all accurate lol

 

[Josh]

You should document the growth of your T so you can figure out just how fast they grow! Take one photo a month with the same item in the frame for scale - then at the end sew them all together into an animated photo!
OK maybe I'm getting a little carried away