I think 72 hours once a month is a solid schedule for all of the important fasting benefits.
I like half an avocado as a fast breaker. Then 12 hours, than the steak.
I think eating once a day is the healthy way to maintain body weight. Eat what creates satiety and happiness for one hour out of 24. If you’re looking to lose adipose tissue, same meal every 48 hours. Blood insulin reduction is the key, and goal here, insulin presence blocks the fatty acid metabolic pathways.