[gr33nman]

I think this is good advice in the context of the OP's current situation. However, the concept of "core hours" is a somewhat outdated legacy of industrialization, and is of questionable value in the knowledge economy, with all of the innovations in communication available to us now. For example, many companies employ foreign workers who are not around during "core hours", and while it presents challenges for communication, companies that are motivated find ways to make it work. I suspect that companies able to be flexible about where, when and how much employees work will have a competitive advantage in the next decade.