How long does production and shipping take for smartwatches and fitness trackers from China?

Timeline for smartwatches and fitness trackers from Shenzhen, Huizhou, China: Sample production: 3-7 days. Sample shipping: 3-5 days express. Bulk production: 15-30 days depending on order size and customization level. Shipping times: Air freight: 5-10 days to USA/Europe. Sea freight: 25-35 days to USA West Coast, 30-40 days to USA East Coast, 25-35 days to Europe. Total lead time: Express samples: 1-2 weeks. First bulk order sea freight: 6-10 weeks. Reorders: 5-8 weeks. Rush air freight: 3-5 weeks (shipping cost 5-8x sea freight). Important: Chinese New Year (January/February) adds 3-4 weeks to lead times—plan orders before December or after March.