Due to the progression of the comic it seems that the 'it's been 5 years' is intended to mean 5 real life years. If one real life day is 500,000,000,000 years, that means one real life year is 182,500,000,000,000 years, so videl has spent 912,500,000,000,000 years being tortured. I was going to say "there's no way she'd have any remote isgn of identity left by that point, but honestly if you look at the final panel of her face it doesn't look like she's anything but a completely mindless drone, so that checks out.

Base +6