If you aren't able to get your job done in 40 hours, you're either inefficient or your employer is taking advantage of you (or both). Accepting abuse and asking for more of it isn't being "professional," it's diluting the value of engineers everywhere.
I know, employers are using "the economy" as an excuse for why everyone should put in an extra 20 hours a week on top of pay cuts, as a stick and saying "you should just be thankful you still have a job." Life's too short to work yourself to death, particularly when you aren't being properly compensated for it.
When you're responsible for over $1 billion worth of gas and steam turbines that supply power and steam for a site that has a gross profit of over $6 million each and every day, you will not advance very far if you have the attitude of "I put in my 40 hours so I'm going home". Something tells me that those who don't work any time over 40 hours per week do not involve themselves in turnarounds or major outages. Deferring responsibilities and not being a leader in your role / department is not "professional".
My company isn't using the economy as an excuse. Extra hours are our personal choices on this site to get our equipment up and running. And if whoever has responsibility for a turnaround or outage is not available for any decision and that subsequently delays the RTO date, it will be duly noted for the annual review. Money lost for the company due to a weak work ethic is money / opportunities lost for the employee.