He chuckled a little, some of that exhaustion seeping through again as a hand subconsciously rested on his duffle bag. "It's okay," he said, his free hand rubbing behind his neck. "I've just been, uh...working a lot of hours lately."

Which was true enough, anyway. Between all the Gizmoduck stuff and a few extra hours he'd been putting in at the lab, he wasn't too surprised to hear he was a little worse for wear.