That includes sleep? If you sleep 8 hours, awaken at 6 AM, then eat at 2 PM, it&#x27;s a 16-hour restriction period?<p>I naturally go longer than that without eating each day. If you skip breakfast and lunch times, and include the hours you&#x27;re asleep, it&#x27;s easy to &quot;fast&quot; for closer to 20 hours or more every day.<p>I wouldn&#x27;t force that though, I think everyone is different, living different lifestyles, and their optimal eating cycles will reflect that. When I&#x27;m working primarily sedentarily on the computer, then I&#x27;d rather work all day and eat quickly in one sitting at the end of the day. But if I&#x27;m spending all day doing manual labor outside in the sun, I&#x27;ll naturally want to eat and drink more in between.