Correction: exchanging Watch size sends you to back of line, salespeople were mistaken Only exchanging a defective one is 7-10 biz days. Caught this when looking at the web confirmation, the replacement was also 38mm. -- New Apple sales procedure just released: buyers can exchange sizes. Call 800-MY-APPLE, tell the IVR system "Apple Watch Sales". They email you a shipping label, you send back, they send you the new size for the difference in price. 7-10 business days from the time they receive your old watch, i.e. you don't go to the back of the sales line. I just did this with Sport/white band, from 38->42mm. Not sure of the delay for a model with less availability.