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.
I get my rattie roommate right? Because five days to him is like 5 months of his life and I would miss him and he would miss me....
Do I get to have my dog? Don’t see an issue then.
A book? yep I bet I could. This past year for personal reasons I've spent 95 percent of my time without anyone around...I must admit I had a computer..but 5 days? easy.
Done it - with full-time semester courses to study. I gave myself goals, ex: you can't wash your hair until you finish this or that. Criminal justice and abnormal behavior courses. When I finally emerge from my home to buy food or if a JW comes to my door, I speak or try to. Not much comes out at first. Talking and hearing my voice would stop me from talking, because it didn't feel right, mostly because there really wasn't anyone I wanted to talk to anyways.
The 'rules' are not explained well enough. Could there be books, for example? Would creature comforts; water, foods, addictive coffees/teas be provided?
Would one be isolated in a room, or a cabin in a distant woods, or perhaps an island?
For me, with foodstuffs, access to outdoors, the temperature reasonable, by whatever method, and an assortment of books, my tenure there might run quite a bit longer than a week.
I could easily go for 5 days (or even longer) without human contact, in person or virtual.
I couldn't do it without my computer though. I use my computer probably 75% of my waking day.