"We're at the halfway point, right? Seems like a good spot for a short break." Not that Jim isn't somewhat used to sitting around for hours on end, but even when he was still on duty on the Enterprise, he would often get up and stretch his legs while checking on his crew's stations. And now that he's teaching classes at Starfleet Academy, he often chooses to meander a little through the lecture hall while conducting class, as well.