USING LIFETIME
Record a habit. See your time.
- Choose Exercise, Food, or Water. The Log activity button gives you a shortcut to all three.
- Enter the date and what you did. Review the estimated change before saving. You can try an estimate without an account; sign in to save entries to your personal ledger.
- After saving, open the total time card on Overview to view your Life Ledger. Expand a date to see its entries and daily total.
“Lifespan Added” is an LTE model-based motivational estimate from your recorded habits, displayed in minutes, hours, and days. It is not medically verified actual lifespan extension or a prediction of how long you will live. The current calculations are provisional and have not been formally calibrated.
Read Method & limits for the scoring inputs, daily limits, bonus rules, worked examples, and the distinction between public-health evidence and our product choices.
What to record
Exercise. Choose the activity and enter the requested details, such as duration and effort. Record each session once. Walking can use measured steps or an estimate from distance or duration; exclude steps already recorded as running or ball sports. For swimming and ball sports, use active time rather than long breaks.
Food. Choose a fruit or vegetable and record the amount you ate. For countable foods, check the suggested whole-item weight and adjust it when needed. You can enter part of an item. These entries track selected foods, not your complete diet.
Water. Enter the amount you drank in milliliters. Water rewards have a daily limit and are not a drinking target. Do not drink extra water to earn time.
Understanding changes to your total
The preview shows the estimated change to your ledger, rather than the duration of the activity itself. Entries on the same day are considered together, so splitting one session or food portion into multiple entries does not repeat its full reward. Consistency and variety can also affect the result.
A saved entry can add no extra LIFE time when a daily limit has been reached or its details have not changed. A zero change does not mean the record failed to save; check the save message and the history on its category page.
Reviewing and correcting your records
Edit or delete an entry from its Exercise, Food, or Water page. For example, if you entered a walking session twice, delete the duplicate from Exercise history. Your ledger will recalculate; a correction to an earlier date can also affect later estimates.
Sign in with the same account to return to your saved ledger. Read Privacy for how records and change history are stored.
A first day, step by step
Suppose you walked for 30 minutes, ate half an apple, and drank 250 mL of water. Open Exercise and choose Walking. Enter the date, walking duration, and age; use measured walking-only steps if available, or check the estimate. Review the preview before saving.
Next, open Food, choose Apple, and enter 0.5 items. Check the suggested edible weight and adjust it if needed. Add 250 mL on Water. Once signed in and saved, these become three entries on the same date in Life Ledger. This example is not preloaded into your account.
Before you log
Our exercise guide explains steps, active time, and working sets. The food guide covers edible portions and mixed dishes. The water guide explains amounts and zero-point saves.