Hi! In the US, we generally refer to their size in terms of diagonal leg span (DLS) - the distance from the tip of leg I on one side to the tip of leg IV on the opposite side.
This T appears to be a male. You can see a pretty evident patch of epiandrous fusillae just between the anterior book lungs (a darker "dot" of short, dense setae), which are male reproductive organs.
leg span is more informative than body size...I will use a mature male as one example as to why....upon maturing, a male's leg span will increase significantly, resulting in a larger spider...but if you measure body size, it would give the false impression that the spider actually shrank as a mature male's body will be a little smaller.
Don't be too disappointed - a male G. pulchripes will still live in the neighborhood of 8 years (maybe longer) and will be in demand when he matures, so you can usually work out a deal that will get you a handful of new ones assuming he produces.
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