Won't kill the car if u run out of juice, but over a period of time you aren't doing the car/turbo any favours.
Most ppl with turbo cars are really that up on them as they just want a car, often see them turn them off without 1min idle say. If u watched Fast and furious they are all the worst ofenders for turning there cars off after ragging them, and they are mean't to fool ppl into thinking they know there stuff coz they can say NOS! lol