@monalis I agree wholeheartedly. Getting in enough calories so that one's metabolism doesn't fall through the floor is extremely difficult, especially when you're eating all those healthy complex carbs that fill you up quickly. I eat very slowly to begin with. Anything less than two hours is impossible for me. I've tried, and even limiting myself to those two hours is very uncomfortable; I could tell each time that I had done my body wrong. One day, I even tried adding extra calories in the form of sugary foods that are easy to consume too much of. It was easier, but I still just barely made it to 1000 calories.
I think a good plan would be to try to buy more calorie dense foods, and get micros in the form of high-cal smoothies since drinking is a bit lighter on the stomach. At the moment, that's not feasible for me, so I think I'll just refuse to be so regimented. Personally, I'd theorize that the body benefits more from variation, and I'd rather move my fasts around a little each day, even extending them when need be, to accommodate a longer eating window than stuff myself to the point of discomfort.
A strict regimen is good to help you get in the groove of things or if you feel like you're slipping off track, but why bother if you know you can trust yourself to not break the fast early and to start the next fast as soon as you've met your requirements?