if I need to do something in 4 days from the time of 10:47 PM what time will it be and what day

If you need to do something in 4 days from 10:47 PM, it will be at the same time on the 4th day.

For example, if today is Monday at 10:47 PM and you need to do something in 4 days, you would do it on Friday at 10:47 PM.