I would wait twenty minutes, but since my T is always on time I would be worried. If he kept me sitting for twenty minutes just by running late, I would be long gone bc he is completely inflexible with going over time in general. If we misunderstood the time or he ran late etc, and I was there but he wasn't, he would be so anxious my heart would go out to him. He expects a lot from me, but more from himself. If he made a mistake, I would be forgiving bc it never happens.