I do this, different times but between 15-20 hours/ daily. I enjoy it much more than water fasting. Once you get used to it you feel so much better all the time. I am doing this in conjunction with transitioning to raw foods which makes it great because when you haven’t drank water all day you really only crave juicy fruits. My addiction to processed/junk food has gone way down.
I highly recommend it! Since you’re already fasting, just go for it
The big draw is that it burns more fat. 3x vs 1x supposedly. But only for the time you are in the depleted zone.
That will be limited on such a small fasting time. You might like to try 24h fasts or 48h - they produce more of a kick. 3 day and you really see some changes.
Also builds resilience and toughness. The theory is that body breaks down fat to produce water, but will only develop this ability if it has to.