Read the metric definition
The week chart scales bars relative to the largest value in the displayed seven days, with a minimum scale. A bar's physical height is therefore not an absolute fixed unit across different weeks.
Inspect the contributing records
Compare the numeric labels and underlying records, especially if you are looking at screenshots taken on different days. The same duration can occupy a different fraction of the chart after the maximum changes.
Main-history summaries exclude the active session and archived records. Editing, archiving, restoring, deleting, or importing records can therefore change a chart without any new session having occurred.
Check the relevant distinction
When a large session leaves the rolling window, the remaining bars can grow visually without their stored durations increasing. The relative scale changed, not the session timestamps.
| Check | Practical meaning |
|---|---|
| Within a chart | Relative visual comparison |
| Across dates | Check numeric values |
Interpret within the data limits
Use the values for comparisons that require precision. A visual impression across differently scaled screenshots can overstate or understate a change.
The chart's compact hour labels are rounded, while individual records retain hours-and-minutes displays. A summary is a view of stored timing data, not a measurement of nutrition, mood, or medical outcomes.
A worked walkthrough
Imagine a chart whose largest daily value is much greater than the other six values. The tallest bar establishes the relative scale for that view. On a later day, that old maximum falls outside the rolling window; the remaining values can now take up more vertical space even if their records are unchanged. Conversely, restoring a large archived record inside the visible period can compress the apparent heights of smaller bars. If you compare screenshots using physical height alone, you might infer a change in duration that did not happen. Instead, compare the numeric labels, dates, and included records. Then inspect individual minute-level durations if the question requires precision. Relative scaling helps a small chart use its available space, but it means visual comparison across separate views needs more context than matching the tops of bars.
Fastly is a lifestyle timer and journal. These notes explain the app and offer reflection prompts. They are not medical advice or a prescribed eating schedule.