I think you could do almost anything for a day. One day is “Here’s Jim, he’s new, and we are going to show him how we do things here” stuff where little actual work happens.
A month would be a more realistic situation. I wouldn’t want to be military in an active war zone, work for a drug/trafficking cartel, or any other dangerous profession where the likelihood of dying or going to prison is high. Or professions where I’d have to actively harm people.