The time it takes to charge a phone can vary depending on several factors, including the phone’s battery capacity and the phone’s current battery level. For optimal wireless charging performance, it’s recommended to use a relatively thin and non-metallic phone case.
Thin cases allow for better transmission of power between the charger and the phone, leading to faster charging times. Additionally, removing the case entirely can sometimes improve charging efficiency, especially with thicker cases.
Base on my maths with a 30min timer
Galaxy S20 OFF
50% => 64% and 28.00% Increase
No case
Galaxy S20 ON
48% => 61% and 27.08% Increase
No case
Galaxy S20 ON
38% => 48% and 26.31% Increase
With a case on
Note: In general, using the original charger that came with the phone is usually the fastest way to charge it. However, the charging time can range from about an hour to several hours, depending on the factors mentioned above.