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Dear if you are using MIUI9 global beta 7.8.24 for redmi 4x.
The charging time will be reduce to 1:15-30 hrs.
Standard Xiaomi Charger 5V at 2 amps .
Turbo Charger - Turbo power 1 9V at 1.6 amps and Turbo power 2 12V at 1.2 amps.You can notice a change in icon near battery bar fast charging is one with MIUI 9 Lightning fast Bolt symbol with a circle.