although I don't do a full 16+ hours just because of personal preference and how my schedule works...I average 13/14 hours each day. I think anything over 12 hours is still beneficial.

Longer fasts (1-3 days) are supposed to be crazy healthy in multiple ways, but I ain't about that life.

The fasting itself is very easy, but from time to time I still get really bad crashes after lunch. Important to remember to break the fast with something small like a piece of fruit and wait another hour or two before a meal, and stay hydrated.