Earlier quoted context omitted.
Exactly that. If it's some "policy" and not something objective you will sound clueless. Many people just sit in corporate environments waiting for the clock to hit 6, and do nothing until they leave. You don't want this kind of behavior. In case his work is time sensitive, it's a different problem.
That's the challenge I am facing. We are very flexible with the timings. It usually works for us. We seldom find people misusing this freedom. But then, once in a while we come across this situation. I am not sure asking the person to stretch a little more will help the coarse. I want him to be motivated intrinsically.
On the other hand, you might think that making her stay longer hours will deliver more result - but that's not always true. In fact, she might even lose her productivity and deliver significantly less than now.