Paul at Perfect Health Diet is a big proponent if IF, there is some good info there. Perfect Health Diet - A diet for healing chronic disease, restoring youthful vitality, and achieving long life | Perfect Health Diet
I regularly practice IF and it makes me feel great. More energy by a mile. It helps that I am almost never hungry first thing in the morning, so I just wait until I am. Typically around 11:00 am I am starving. For me that makes ~16 hours. My limited understanding of the benefits if IF is that you need to get to around 14 hours to see the benefit.
I think that IF'ing is a very personal journey. If you don't feel better, then it probably isn't worth doing.