I don't know . . . I know I can't complete my work in three hours a day. I'm actively teaching my students 4.5 hours each day. On a typical day I have about 30 minutes of assigned duties here and there supervising students in various situations. And then every couple weeks extra assigned duties fall my way. In between those things, I have to prepare for lessons: No matter how many years I've taught, I still have to Xerox papers, locate /put away sets of novels, bring out materials for the next unit. And then there's grading papers -- and I spend about an hour a week on record keeping. Parent contacts. Special ed paperwork. I don't have much down time on the job.
More to the larger point:
I definitely spend more money in the summer months when I'm not working.
Though I know it's a common thing, I do not personally fall prey to the thought process of, "I work hard; thus, I deserve _____." It's just not one of my shortcomings -- I do have plenty of others.
During my working months, I tend to do bath cooking and freeze meals. We don't eat out often.
In contrast, during the summer months I'm quicker to say, "Yes, let's meet for lunch" or to go to a movie. And I spend more on crafty-materials, which my kids and I enjoy. I love to cook, and I spend more on fancy ingredients during the summer months. I try to do the bulk of my Christmas shopping and home-maintenance during the summer months, and that adds up to money spent.
I don't know that I'm typical -- well, no, I am sure my spending is absolutely not like that of the average American -- but working 40 hours seems to keep me from spending.