Longer fasts - when do you experience mental clarity, what hour is hunger the hardest?

Been fasting for over a year, have lost 14kg (30lbs), still have probably 11kg (24lbs) to go. Normally do 16/8 with around one 36-40hr fast once a week. Am currently attempting a longer 48-70hours fast. I have never experienced the mental clarity, nor hunger dissipating I see often described in this community, am wondering if these are things that only happen beyond the 40 hour mark? What hour do you normally experience the mental clarity switch? Are there particular hours that are hardest to get past the hunger for you? via /r/intermittentfasting https://ift.tt/4CHghZc https://ift.tt/AFWYbQJ