If you’re just getting around to ordering your 21-inch iMac, don’t expect it to arrive in just one week. MacRumors points out that shipping time estimates for Apple’s (AAPL) 21-inch iMacs have increased to two to three weeks in many European online Apple stores. The 21-inch version of Apple’s newest super-slim desktop computer has typically shipped within seven to ten days of being ordered and has usually not experienced the kinds of delays that we’ve seen with the 27-inch iMac models that are likely to finally start shipping next month.