Working even half an hour extra each day adds up to ~3 weeks a year of extra work that you're not getting paid for. That's several thousand dollars in wages. It's easy to dismiss a half-hour here or there but if you sit down and run the numbers, it's quite an unpleasant conclusion.
What if your salary already has that factored in? What if you wouldn't have that salary without those extra 3 weeks/year you are working? To say it another way, if I only work 1 hour/day and run the numbers it is a great conclusion.
That's kind of what I'm getting at, though. If a job is advertised at $50k, and then you find out they expect you to work 9 hours a day instead of the usual 8, it's really more like $44k. Such discrepancies just make it harder to compare apples to apples when looking at the job market.