Do you keep time?

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I know that some people have problems keeping appointments and are sometimes late or worse, do not show up at appointments. I have just canceled an appointment with someone who said she is coming at 5 in the afternoon. I waited until six in the evening but she did not show up so I was out the door when the clock struck six. Later on, she called me on my mobile phone asking if we could still meet. But it was almost six thirty in the evening so I said no. Do you also do this?