I think that's a great approach but I think the people predisposed to working longer and doing overtime are often the sort of people who won't willingly take that time off. Do you have to encourage it or it's welcomed?
I've worked in companies that did this and if those people refused to take time and insisted on working late it was viewed as a bad thing and they were told as much. People who work hard are generally ambitious so telling them it's hurting their career makes them reevaluate pretty quickly.
