"But you get 3 months off a year"

How do you respond to this or similar comments? I was driving my roommate home from work today and I was telling him how today was stressful for me. And he said "How can your job really be stressful though? Like you still work 40 hours a week but you get 3 months off a year"

And he's wrong about the 40 hours thing. To make sure everything is ready for the day I'm usually there about an hour early. Which isn't much more, but it's still more. Buts he's kinda right about the 3 months. 1 week for spring break, 1 for Thanksgiving, 2 for winter, and 2 months for summer. He also said that that's why it's okay that teachers get paid less, because we work less days than other jobs.