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Quick Summary
Calculate total vacant days per listing by summing all availability windows.
Compute the average of those per-listing totals across all unique listings.
Handle empty datasets gracefully and round the final result to two decimal places.
What This Tests
Two-level aggregation patterns
Date span calculations excluding boundaries
Aggregate function behavior on empty inputs
Numerical precision and rounding control
Common Patterns
Aggregation
Date Arithmetic
Groupby
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