Completed sections are your real progress.
Count finished shelf sections, not loose books moved. A run with many scattered books but few completed rows still needs collection, sorting, and placement work.
Run calculator
Turn the remaining shelves into a route.
Set your team, experience, and progress to get a practical workload and role split.
Full cleanup
16 sections remainSplit into 2 roles: runners, sorters, and shelvers.
Efficiency index: 14. This is a route-planning comparison, not a promised completion time.More players only help with clear ownership.
The planner rewards teams up to a point, but it assumes runners, sorters, and shelvers are not all touching the same pile. Uncoordinated co-op can be slower than a careful solo clear.
Use the index as a comparison, not a timer.
The result is an effort band. It does not claim a guaranteed minute count because missing books, server lag, player experience, and update behavior can change the final clear.