It completely depends, voted second. For lectures, I can sometimes even be a little late and be a douche. I always try to end up on time, by making good time. I don't like taking a bus half an hour earlier in case something were to happen. I like to make good time. Also if I make an appointment with a friend to be at his house at a certain time, or meet up at a certain point, I wouldn't follow that to 100% - I'm very likely to be somewhat late. But some cases, like exams, doctor's appointments, seminars and what not I try to get very early.