Yeah you certainly get a taste of it pretty early, and I think that taste is what made me intrigued to keep going, but lets be honest that taste is pretty well spoiled by increasingly desperate hunger. But I've just hit ~87 hours now, and everything else bad that happens mentally in the 18-60 hour period gets noticeably nicer once you go beyond the 60-70 hour mark, which makes that quietness way more enjoyable. Slept like a baby for the first time since starting last night, which makes a world of difference. Being too hungry to sleep is a special kind of hell.

This confirms some stuff I'd read on fasting. I'd read somewhere that the main pain is associated with re-establishing a new steady-state in which you're getting all your calorie needs from eating your own fat instead of your stomach contents, but I wasn't really sure if that was just wishful thinking by brain-washed fanatics. Fasting is still a non-mainstream practice so it's kinda hard to find reliable sources of information on it. But this particular point seems to be 100% legit, at least in the experience of this sample of one.