i've only had my B. vagans a year now and she's right at 3 - 3.5", Both my Albo's are 2.5-3" also. My B. sabulosum is also right at 2.5-3". All of these were ordered at 1/2" or less. So that's what 2-3" in year? These are supposed to be medium growth rate if i recall correctly. So my PZB will probably stay hidden in the substrate burrows until i'm in my mid 50's as they're slower growing than the Brachys