What this search usually means in real life
Elapsed time and working time are not the same thing. A task can spend most of its life waiting in a queue, waiting on a decision, or getting bounced back for revision while everyone involved still feels busy.
That is why โit took longer than expectedโ often points to workflow design, not effort.
Tasks stall between handoffs
Priorities change midstream and force rework
Approvals or missing information hold work in place
People start more work than they can finish cleanly
Estimates ignore interruption load and exception work