When I was doing this, I did two eating windows. So I did two 10 hour fasts (one while sleeping) and two 2-hour eating windows. Generally, I ate breakfast and skipped lunch, ate dinner.

I know I felt better doing it, as I got that boost in ketone energy, but I also wasn't well enough adapted to do it all the time.

My understanding is that any break you give your digestion is great - anything past the 4 hour mark is pure fat burning, if I remember... So you're getting two mini-boosts...

As long as you don't feel the need to snack between, you're probably doing fine as you are... If not, do it 6-12 weeks, and if it isn't working, change it, etc.

I fast from about 9pm until 4pm and just have a bulletproof coffee in the morning. I didn't go out of my way to do this fast but as I got more adapted with IF I went from 2pm to 9pm eating to 4pm to 930pm eating. This might seem late to some but I work 9 am to 7 pm 5 days a week and I don't have a way to heat food at work. Sometimes, based on work, it turns into a OMAD schedule, particularly when work is crazy and I don't have time to eat. I take food with the hope but sometimes it doesn't work out, however I make sure I am drinking water throughout the day.

I find my coffee really helps me stay full and happy during the day even when I get 10,000 plus steps in while on the job. 2 tbsp heavy cream, 1 tbsp butter, 2 tbsp unsweetened almond milk, blended and yummy. The fat really helps me as I don't feel hungry and my energy is really high. This is just my 2 cents with what works for me.