How are you at keeping to a schedule? Are you organised and punctual, or will you get there when you get there? Is it better to show up late than to not show up at all? Do you have many appointments that you need to keep to in your life, be they social or work-related?
I'm a weirdo, according to those around me, so schedules are really, really important to me, unless they can be avoided. I'd rather be three hours early then five seconds late, which is why I'm always in a rush from one place to another, 'specially when I need to be there. It's all just a simple question: "Is it important to me as a person?" That's all there is to it for me. If the answer is yes, expect me there either early, or before you're even started.