Ultimate molt (8+ instar)

Hello again. I've been online as per usual looking up different species of scorpions and yadi yadi yada.... Some scorpions, such as Centruroides species, can reach an ultimate molt. An ultimate molt, from what I know of, is the utmost highest possible molt the specimen can reach.
Allow me to direct this question to some of the more experienced keepers: How long does it take for an adult scorpion to reach its peak (7-8+ instar) Also, if anybody is familiar with this, a list of certain species would be helpful.

I was digging around the forum when I saw this: http://www.scorpion-forum.com/t2134p15-info-scorpion-facts

If you scroll down, you'll see the picture of a Centruroides bicolor that one of our members Venom posted. This, I believe would be an example of this species ultimate molt.

Well, for one thing P.transvaalicus is not the biggest Buthidae, P.villosus is.
From my experience with raising Parabuthus, they usually take a little more than a year to reach maturity.

Sometimes they never reach that ultimate molt. I think C.margiratus can reach 8i but will mature at 7i and stay 7i if bred.