It's about the amount of time you can run a loud ass saw under a car in plain sight and not get confronted, or shot or stabbed. or kicked in the nuts.
It takes about 15-20 seconds to cut thru one pipe probably. from what ive seen on video.
The cable wiggles back and forth and you cant get a good bite on it. so it becomes an effort in futility. that and the blade will start jumping and then it'll hit the car and make shit loads of noise. it's a deal breaker unless you have a remote location and have 20 minutes to chop away at the shit.