That's only if you're lucky. At least in America, 10 or more hours a day is quite common. In the tech field, some weekend work is also not unheard of. In some companies and industries (like game development, startups, finance, not to mention insane shifts that nurses and doctors are forced to work), death marches and sweatshops where you work 14 to 16 hour days for months on end is the (pathological) norm.
The above doesn't even count the times where you bring the work home with you, nor how the crap you have to deal with at work affects the rest of your life emotionally and the (usually detrimental) effect it has on your health.
You do get compensated somewhat financially for this. But how much is your health and emotional well-being really worth?
Consider this next time some company sends out a pitch for a ninja or rockstar that loves to work in an "exciting", "fast-paced" environment.