Best time to update TGP/MGP sites
 

Most (if not all) press that rebuild or update button once a day, 6 or 7 days a week.
Do you base yourself upon any timezone to update, for example every day at midnight CET or something or do you press it whenever it pleases you?

Is there a timezone better then others to base yourself upon? I'm talking about TGP/MGP sites that have overall traffic, not EU or US specific.

I'm rebuiling my TGP twice a day