Hah, I'd say the program crashes but not the whole computer but maybe I'm not using the term correctly.
Wow, 7 hours is crazy long!
Mine is with a USB cable, I just stick it in, wait until my program unfreezes and then I can work. Maybe try charging it during the night?
then I'd say you specialize in digital art :) I'm familiar mostly with traditional and I can't really get the hang of digital. I'm okay with sketching and even layers (although planning them is a crazy task) but I never got to coloring. And I'm clueless about blenders. I know it's a matter of practice and trial&error and finding stuff that works for me but right now I can't find the time to sit down and draw. But maybe I should for relaxation (although just using my laptop is a stress not to mention actually using the tablet)