I had one that was a solid 12", maybe larger.. I rescued it from a LFS, to only have it die a few days later (due to old age? I was thinking internal parasites or something.. It wouldn't eat and had bad poops..)
However, Wild Green Terrors are suppose to be smaller max size, around 8".. When they were first in the hobby, not as much selective breeding had been taking place, so if the information comes from an out-dated resource, that COULD of been the max size at that time.
It looks as if my wild Peruvian Green Terrors don't get much bigger than 7-8", but ECSZ-1 has some Ecuador Green Terrors that are larger then that.