What I’ve learned while working for international companies, is that no matter where in the world they work, when the client is awake and working they expect that all teams will respond within the time zone that suits the company at one time or another. The great benefit of having people in different time zones is that work on a project can continue 24/7. The great negative is that if the management doesn’t fully understand this benefit then a lot of work can be lost in staff recovering for having to change zones in order to attend a meeting at a time where they are not working at their best.