According to Scorpions of the World by Roland Stockmann and Eric Ythier, 70mm. This is a middle east desert specie. So dry desert conditions, warm, etc. I would provide a burrowing sand or sand/clay (2/3,1/3) substrate, maybe 6" deep if possible. Apparently they will often make their burrows under rocks. So I would provide a good stable rock for this purpose as well. Good luck, and show us pictures someday if you can!