Seeed uses Hongkong Post by default, in our experience these packages usually take 4-7 days to arrive. When your order ships, Seeed sends a status update with a tracking number like EE123456789HK.
Use the Hongkong Post tracking site to see when the package leaves China. HongKong Post only tracks to the Chinese boarder, but they provide links to local mail services that provide further information in some countries.
Artwork by Aaron, Creative Commons Attribution 3.0.