The Apple x is fully charged with 20w in two hours. iPhonex supports the PD fast charging protocol, which can reach a fast charging speed of 29W, but if you want to achieve fast charging of iphonex, you need not only a charging head that supports USB and PD fast charging, but also a USB-C to Lightning data line.
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iPhonex mobile phone using fast charge compared to the traditional 5W charging head charging speed is actually more than 3 times faster, when using USB, PD fast charge head and USB-C to Lighting special fast charge line, iphonex from 1% charge to 51% only 30 minutes, to full 100% total time 2 hours 14 minutes. If you use the traditional 5W Apple original charging head, the 1% charge will only be charged to 19% after 30 minutes, and the total time for 100% charge will be 3 hours and 22 minutes.
With the original Apple 20W charging head, it takes about 1 hour and 50 minutes to fully charge. On the surface, it takes nearly two hours to fully charge an iPhone12. Although it feels like the charging efficiency of 20W is a little low. However, compared to the original 5V1A, it does save a lot of time.
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Apple's Fast charging is generally slow to charge, and iphones use a lot of power. In general, Apple phones rarely support fast charging and flash charging, using the original charger.
Apple Fast Charge 20w full takes about 2 hours 30 minutes. Of course, depending on the health state of the battery, the charging time is relatively short.