How Do I Tell a Company 8 Hours Per Day is My Max?

Dear Experts, Once in awhile I read a job announcement that lists something like "and other duties" as part of their job description. Other times I've seen specific examples of employees having to take classes, go through training or even learn another language outside of their regular work schedule. When I've put in my 8 hours, my personal time is mine and I believe companies asking for this are asking too much. I'm ready to say I'm not doing it, but how? The answer I'd give now would be, "I didn't plan on this when I accepted the position and I have other personal commitments," even if that means I'm relaxing at home. I know it could mean I'd lose the job. So how would you say "No thanks?" Our Twitter Advice Project (T.A.P.) is no longer an active campaign. To find an answer to the above question, please use the "Search" box in the right-hand column of this website.