Of course when it got to the larger poses that is when it got interesting. He could hold the pose all the way through on some of them. Everyone that was drawing seemed to understand and no one looked perplexed by his short poses sometimes.
What I like to do in these cases is try to predict how far a model's arm will droop from the original start, or at what point they give up on the pose. I've seen enough to know when they will have a problem. I don't do it to bust their balls or complain, it's just a mental exercise I have going through my head to see how well I understand the figure and how it behaves.