How is Session min (session duration) measured?

From Operation: Start until the first 告一段落 wrap-up message is delivered. (Updated 2026-07-13 — previously it used the Operation: End event; so values now typically read a little shorter, and many sessions that were ‘Complete’ but blank now show a duration.)
A 2-hour cap is kept for the headline value; occurrences whose Start→wrap-up span exceeds 2h are not dropped — they are flagged as ⚠ <time> (>2h) with the raw duration shown, so long / multi-day occurrences stay visible. Sessions that never reached the wrap-up show —. Video & audio minutes are measured separately (below) and were not changed.