I have the 29W adapter with the USB type C cable for my iPhone X. The first time I used it, it charged the phone from 10% to 85% in one hour and charged it completely for an hour and 45 minutes.
I've noticed twice now that charging got slower. After an hour, it charges my phone from 10% to 80% only and takes 2 full hours to completely charge.
I've noticed twice now that charging got slower. After an hour, it charges my phone from 10% to 80% only and takes 2 full hours to completely charge.