I got my first frog in August 2008. He was maybe an inch long. Very small. In March 2009, I bought another one to put in with him, and that new one was a couple inches and had a pretty good weight to him. By July or August, I knew I needed to get them a bigger cage than the 12x12x18 cage they were in (which is about the same space as a 10 gallon).

So...within a year, I needed to upgrade.