# V18 overlap report example

The example is synthetic and uses `Asia/Tokyo`.

| metric | seconds | minutes | definition |
| --- | ---: | ---: | --- |
| segment sum | 8,100 | 135 | add A, B and C |
| covered union | 5,400 | 90 | time with at least one active segment |
| overlap interval | 1,800 | 30 | time with active count at least two |
| sum overcount | 2,700 | 45 | segment sum minus covered union |

The overlap interval is 30 minutes while the sum overcount is 45 minutes because the 09:45–10:00 interval has three active records.

Unknown boundaries must remain unknown. Billing, payroll, contract, and labor-law decisions are separate human decisions; this report is not an invoice or a labor conclusion.