Niko on 18 Nov, 2020 08:07 PM
The difference is due to rounding. The start and end times are rounded down to the minute, while the duration is rounded to the nearest minute.
So in your screenshot you might have started the timer at 8:45:50(seconds) and stopped it at 9:00:05. Then the duration of the timing is 14 minutes and 15 seconds, which is rounded to 14 minutes.
If you want it to show a duration of 15 minutes, you can set the rounding of the task “Kunden” to “round up to nearest minute” after right-clicking on the task > "Get info”…