Air Mail: 7-15 work days.
Royal Mail(To UK):7-15 work days.
EMS: 4-6 work days.
DHL: 3-4 work days.
Track site:
Air Mail: http://www.17track.net/en/
Royal Mail: http://www.ec-firstclass.org/
EMS: www.ems.com.cn
DHL: www.dhl.com