3-week Darkness Retreat in Guatemala.
 Dawning of Clear Light: A Western Approach to Tibetan Dark Retreat Meditation (2003)
Guess I won't spoiler it but the guy has to make a pretty big decision in order to complete the bet - here - https://en.wikipedia.org/wiki/The_Silence_(The_Twilight_Zone...
Here's a short article about Brian Zembic and his $100,000 breasts as mentioned in the title:
Brian also performed a bet where he tried to stay locked in a bathroom for 30 days to win $14,000.
I'd take this bet.
This might be daily mail junk, but... https://www.dailymail.co.uk/sciencetech/article-509648/Losin...
Two days shows effects. 30 days? For a novice? No way.
I would expect Alati to at least feel a little physical effect from his stay in darkness.
 - https://en.wikipedia.org/wiki/Peter_Tripp
I'd watch the documentary they will make too.
(and I actually might prefer distant street noise over salt crystallizing on your face and condensation running down your face)
edit: and I don't like the dark for it, because I immediately see or imagine shapes. but they are also just a mere distraction.
The truth is, spending a couple of days without hearing anyone's voice makes you feel out of place and depressed quite quickly, even though I don't mind being alone usually.
It almost seems like a sign that something is wrong on a species wide scale when we need to constantly distract ourselves from our own thoughts to prevent being driven mad.
To me it's like giving away 100k and taking bath salts. Reminds me of the movie "Altered States".