Even if it does not show the estimated time left, your phone is still getting charged. so you do not have to worry about it. If it takes longer than usual then it might be due to hot weather.
Please perform the below mentioned steps to resolve the issue:
1. Kindly check the power socket functionality with a different device or try to charge the device in a different power socket.
2. Check connectivity Please check whether the charger cable and adapter is fixed well. Remove charging cable and reconnect with mobile phone properly.
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
