Also it's referred to as a 24 hour fast, but I've realised that with intermittent fasting (ie not eating after 7pm the day before, and not until 11am the day after) it's actually a 40 (FORTY) hour fast.I did the same then.
Mornings are fine, you’re still burning yesterdays calories.
A R4 prog mentioned 14 hours as significant, after that you start burning fat reserves.
Brutal.