Well, I guess I'm a hard taskmaster. It was never a question at our house. The purpose of high school was not only educating them academically, but preparing them to be adults. With that in mind, during the summers my high schoolers had/have to either be working full time, or doing a combination of part-time work and part-time school, or be doing a close-to-full load of schoolwork. It was never a decision for any of us, it just was (to us) an obvious part of becoming adults. Adults do not expect much time off. A week or two here or there, maybe. If I'd heard any whining about the process of becoming an autonomous adult, I'd remind them that if they weren't ready for adulthood, then freedom to make their own decisions in our house would be seriously curtailed, as it was when they were younger.
Honestly though, of bigger concern to me would be helping a kid without good coping mechanisms to find concrete strategies to help them get through life. A fair amount of what I'd require of them would be personal improvement, implemented either with a mentor, a *good* counselor, or with a clearly developed & researched plan of their own. Self-improvement, both in academics, and in areas of personal growth, was and is my goal for my high schoolers.
Rereading what I wrote, I'm not sure if it's coming off as abrasive...if it does, I don't mean it that way at all. I just know that drama doesn't usually serve adults well, and I try to avoid having that be a predominant personal characteristic that my kids will carry into adulthood. I don't really want the kids to have that mindset, that their desires must be met, that life owes them a vacation, kwim?