This includes no contact interaction with the outside world what’s so ever. No computers, no phones.
Depends what you mean by total isolation. I wouldn't fancy being locked in a cell for five days but to spend five days without seeing another person would be no big deal. for example living in a remote cabin with a few good books.
There was a an early pop song with the words "people who need people are the luckiest people in the world". Absolute nonsense. People who are self contained and can live without human contact are the lucky ones.