"Generally speaking we are aiming to limit our scheduled maintenance period to once a week, on Tuesdays. We are aiming for this weekly maintenance period to take place in an off-peak time for both North American and European players. We are also aiming to inform players of the precise duration of any weekly maintenance period at least 24 hours before the maintenance begins." - if this where true there would be separate offline times for US/EU, not just for one geographical region. You have identified the early hours of the morning as the time of least demand, so both regions should have this as their downtime.