How the Fasting Hours Are Counted

Why hours are counted at all

The protocol is usually described as "three full fasting days a week". That is the rule, but it is not the most useful way to express the scale of the pattern, because it ignores the fasting that every person already does every night. Counting hours — and counting them against an ordinary baseline — is what makes the size of the project visible and checkable. This page sets out exactly how the numbers are arrived at.

The baseline: the fast everyone already keeps

Anyone who sleeps roughly eight hours a night already fasts eight hours a day. Taken as the baseline for an average person:

• 8 hours a day
• 56 hours of fasting per week (8 × 7)
• 2,912 hours of fasting across a 52-week year (56 × 52)

This baseline is an assumption, and it is stated as one: real sleep lengths vary from person to person and night to night. It is used because it is ordinary and because it is held constant, so every comparison below is measured as the increase over a normal year rather than from zero.

What the protocol adds each week

The One Year Fast is three full fasting days a week plus four ordinary eating days. On a fasting day there is no food from waking to sleeping; on an eating day the overnight fast still happens. Counted in hours:

• Three fasting days at a full 24 hours each: 72 hours
• Four eating days at the 8-hour overnight baseline: 32 hours
• Total: 104 hours of fasting per week
• Across 52 weeks: 5,408 hours

The incremental hours over baseline

The figure that actually describes the project is the difference between the protocol and the baseline:

• Each week: 104 − 56 = 48 additional fasting hours — the equivalent of two full 24-hour fasting days more than an ordinary week
• Each year: 5,408 − 2,912 = 2,496 additional fasting hours
• 2,496 hours is the equivalent of 104 full 24-hour days
• Expressed as one continuous stretch, it would be 14 weeks and 6 days — about 14.9 straight weeks — of fasting

What these totals do not mean

The 2,496 incremental hours are not a 104-day fast. They are distributed as 48-hour weekly increases, delivered through three roughly 24-hour blocks with eating days between them. The physiological experience of three 24-hour fasts a week is nothing like the experience of a single long fast of the same total length, and this project deliberately does not attempt long continuous fasts. Anyone quoting the yearly total should quote it as an aggregate, not as a duration anyone endured.

The baseline is also a chosen reference point, not a law of nature. A different assumed sleep length would shift every number by the same proportion; what would not change is the weekly increment of 48 hours, which is a property of the protocol itself and the figure most worth remembering.

What this measurement cannot tell you

A single reading is close to meaningless on its own. What matters is the shape of the series across a year, read alongside the fasting schedule, sleep, training and the notes for that week. Nothing on this site is presented as evidence that fasting caused a change: this is one person, with no control condition, and many things change over a year besides the fasting days.