How long does it take to leave the hotel two kilometers from the examination room?

Half an hour. To avoid accidents, traffic jams, bad weather, etc. Go out early so that you can have enough time to deal with emergencies. Arriving at the examination room in advance can give you enough time to get familiar with the examination room environment and find your own seat, so as to avoid wasting time and energy because you can't find the examination room or seat, thus affecting the examination mood and state.