To be honest, in the "don't steal bikes bro" video, the thief didn't really know what he was doing. It isn't too easy to steal a bike with a drill equipped with a cut off disc. With a decent lock, I have to say it'll take him more than 30 minutes to cut through it with his setup. It isn't really easy to cut through a 10mm lock with a cheap cordless drill & a flimsy cut off wheel (that you can't apply pressure on).

1st - a cordless drill's average max speed is only around 2,500rpm
2nd - you can't apply too much pressure to a drill with a cut off disc because it will break the disc (or the shaft will bend).
3rd - it will take a while to cut through a decent quality lock (like the Evolution serious Krpto locks or NY chains).

If he really wanted to do the job right, he should've brought a cordless angle grinder. Most cordless angle grinders reach 10,000rpms easily. They take 4 1/2" cut off discs which allow you to apply pressure/torque to the disc without fear of breaking the discs.