Oh, our bonus (if you are talking about the activation/wheels rolling time) seemed to be pretty random to be honest. Especially as the accuracy of the button push is apparent;y 24 seconds. I think most people on our complex tended to ignore it to be honest. Anyhow - I agree that times like 'key out of ignition' can be used, but I feel somewhat icky when it's the 200 meter time, an example would be the extra minute it took us to get to a suspended weaving through several estate roads from '200 meters away'.