I have absolutely no idea on how this all works, but assuming they're not replicating the current 'key' and forcing a new one - why not introduce a time delay o

I have absolutely no idea on how this all works, but assuming they're not replicating the current 'key' and forcing a new one - why not introduce a time delay on key changes? Like a reprogrammed key takes 3 hours before it works or something. No biggie if the car is on a mechanics forecourt, but what thief wants to wait 3 hours to drive away the car they've just screwdrivered into?