I always schedule for more than an hour. Force of habit. When I started hiring I needed the extra time. Now I just use the extra time based on what I see, feel and the chemistry between us. In my experience, I've gone a second time, I've played video games, talked, went to Walmart together, gave life advice, did more foreplay, got a tour of his house, watched a TV show while fooling around, and there have been times when I just said goodbye and left.
It's your time and you can choose whatever feels right at the moment. I don't plan anything in particular because I integrate what I feel at the moment. That's important to me, to feel there, present and enjoying the moment. However, you can use the time anyway you can think of.
That said, this might sound intrusive, so feel free to ignore the question: Any reason why you want to schedule two hours without being sure you need the or what to do with that much time? Just curious.