Are you ok with changing your work schedule for a special project?

If your company is running a special project outside of normal work hours, and ask you to take part, would you if it earned you extra money and benefits, and looked good on your CV/resume?
Or would you say screw them, I'm not doing anything for them?

So for the next few weeks I'm going to be heading up a special project for my company, and the working day will start at 4pm and finish at 11pm. Its a slight shorter work day, with financial bonuses and additional benefits. But the company is having trouble getting 12 employees to sign up to it voluntarily. I would have thought people would have jumped at the chance.
What is your view on doing temporary unusual working hours for your company?
Are you ok with changing your work schedule for a special project?
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