Unlimited vacation may not be all that great

Imagine your boss decides to give you unlimited vacation days. LinkedIn is the latest company to offer employees unlimited time off. The online networking company follows Netflix, Virgin and Groupon that tried the same thing. It is known as "discretionary time off."

LinkedIn's vice president said employees can work with managers to request time off when they need it. The move is aimed at reducing burn-out.

But Gred Giangrande, executive vice president and chief human resources officer with Time Inc., doesn't think unlimited time off works. He says it sounds great on the surface, but in reality employees are under a lot of pressure on how much time they can actually take off.

In fact, statistics show American workers only use about half the vacation time entitled to them each year. Even with a policy of unlimited vacation days, most experts say workers are unlikely to change work habits and suddenly take much more time off. That might take a cultural shift.