Why is it still day in Mumbai at 6:47 PM?
This image from https://www.timeanddate.com/sun/india/mumbai shows that daylight ended at 6:44, so 6:47 was three minutes into civil twilight and pretty much close to daylight.

Notice the orange light in the back - I'm assuming that this is a street lamp, which are only turned on at twilight.

Most likely the image appears relatively bright because of camera settings, not because it is full daylight outside.