New here, have a couple nile questions

[Lizard geek]

Just to be succinct, Hi I'm new to this forum. I recently bought a Nile monitor, last June.

So far it has grown roughly 4" and that just seems a lil slow. I'm guessing by thinking that monitors grow about 85% in the first 2 years, and Niles commonly hit around 6'. That should be roughly 18" or so a year at first so 4" in 5&1/2 months seems off.

What is the normal (ish) growth rate for these guys?

Is this about what I can expect?