How fast do white's tree frogs grow to be 4 inches long?

[Bolisnide]

White's take a long time to get that big, at least 2 years or more. They can live to be 25, so they grow very slowly.
My male white's I've had for a long time, is barely 3" long. Females can get up to 4", but it's a slow and steady pace.
I have a female white's and she was 1" when I brought her home in February, she's now only 1 1/2 inches. And she is very well fed.

[helm96]

My 2 girls took about 2 years to hit 4 inches. I am pretty sure they are fully grown now, as they have not grown at all over the last 4 months. Thank goodness, I thought they were going to grow outta their tank. Your frog should be fine if you add one later, I added 1 to my setup that was about 5 months old and my girls were just over a year old. There were no problems and no bullying. They took him right in as one of their own. You should be fine with the plan you have set.