The lap notebook
Three laps. One running clock.
Press Lap at the end of each repeated task. The stopwatch keeps running; the mark records both the cumulative time and the length of the latest segment.
| Lap | Segment | Total elapsed |
|---|---|---|
| 1 | 00:42.00 | 00:42.00 |
| 2 | 00:38.00 | 01:20.00 |
| 3 | 00:45.00 | 02:05.00 |
Read across
Lap 2 took 38 seconds, not 1 minute 20 seconds. Its segment is the difference between the second mark and the first: 80 − 42 = 38 seconds.
Read down
The cumulative column always includes the earlier recorded segments. In this example, 42 + 38 + 45 = 125 seconds, or 2 minutes 5 seconds. The second attempt was the quickest.
Keep your start and finish rules consistent
For repeated tasks, start timing at the same event each time and press Lap at the same finish point. If one attempt includes preparation and another does not, the difference says little about performance.
Lap does not pause the clock. Any gap before the next attempt remains part of the next segment unless you Pause during that gap. Resume adds to the accumulated running time; the time spent paused is excluded. Reset clears both the clock and recorded laps.
Use sound as a cue
Enable a recurring interval chime when you want a prompt every chosen duration. It does not automatically record a lap. Test the tone and volume first. For a single end-of-session alarm, use a countdown instead.
The stopwatch calculates elapsed time from timestamps rather than counting screen updates. Background tabs can delay updates and chimes; device sleep or clock changes can affect behavior. Fullscreen requests a wake lock where supported, but it cannot guarantee that every device stays awake.
Keep a separate record before resetting or leaving. Laps and sound are handled on your device and the page does not save the session.