Q: "To be real honest, Jeffrey, you're not making much progress," said Greg. "Are you practicing at all?" "Well, yeah. Mom makes me. She sits there watching to make sure I'm getting the right fingering and phrasing." "Hmm. I might need to talk to her about that." Greg hated when kids were forced into musicianship. He had been teaching private music lessons for more than ten years, and had seen it often. Parents made their kids miserable. It rarely worked anyway. "You don't really want to take piano, do you?" "No, Sir." "Well... " "I wish my mom would let me take guitar lessons. That would be cool." "You know you'd get calluses like this." Greg held out left hand and showed Jeffrey his fingertips. "Yeah! My friend, Zach, has calluses. They're hard like plastic." "Well, you know, it hurts for a while--until you build them up." "I don't care. I love the guitar. I've been begging Mom to switch me from piano to guitar." "I'll talk to her." "Great! I already have a guitar and--" "--don't get too excited yet. We'll see what she says." "Thanks, Mr. Tenorly." He jumped up and ran for the front door. Then he stopped, rushed back over to grab his piano books, and raced out the door. Greg's 3:30 lesson had been cancelled, so he now had a thirty minute break. Oftentimes, during a break, he would step outside and wander down the sidewalk, observing the townspeople going in and out of the shops around Coreyville Square. But something was bugging him. His dad's birthday party was only a few days away. He hoped he wouldn't regret letting Cynthia talk him into going. Question: How long was Greg's break? === The answer to the above question is
A:
Half hour