Charging iPhone using different chargers. Results time depends on charger a lot. Starting from long 4 hours charge using standard PC USB port with 5v 0.5A. Ending with 1h 40m using Apple 29W type-c charger with USB PD 14.7v 2A. Despite 29W charger is actually the best one it cost too much to use it as iPhone charger – 75$ (charger and cable). There is other option available for fast charge iPhone. Apple 12W iPad charger with 5.1v 2.4A. It is only ~20$. Same 1h 40m for 100% charge.
|PC Port USB 2.0||1:45:00||2:55:00||4:00:00|
|Apple 5W charger||0:52:00||1:25:00||2:20:00|
|Apple 12W charger (add 19$)||0:26:00||0:50:00||1:40:00|
|Apple 29W charger (add 49$ + 25$)||0:26:00||0:50:00||1:40:00|
Fast charging is actually happens only when battery is more or less empty. Charging from 80% to 100% may take same time that from 0% to 80%.
See charging current and voltage details on graphs below for all types of chargers