I keep my window around six hours as much as possible. Sometimes as much as seven or eight if I just can't stand it in the afternoon. Usually I have a small bran cracker (12 calories) in the morning when I take my vitamins, otherwise I get a stomach ache.
I also don't count the 20 calories from the cram in my coffee in the morning.
My official plan is called JUDDD, which is a form of IF/calorie cycling (you can google it), but I also eat during set windows which is not required by JUDDD. In addition I am a vegetarian and low-carb. Wow, I guess I have a complicated diet. But it's working for me! I am using all the ammo I've got.
185/131/120 ~ 5'2"