i cant speak to that, I am a beta tester too for 3 different poser brokerages, and my 6 hour poser day is a light day, I test from 2 differnt machines, but th machine with the external sees at least 6 hours of use a day...poser is almost always up and running in some fashion or another.  

Its always best to have a clean runtime for beta testing anyway, so if she has 60 GB on the laptop's drive, she should be able to load all the things she needs for beta testing on there anyway, and keep the poser stuff she renders for fun on the external, which would see less use. 

Brandy