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Do not choose an automation tool yet. First compare the same checkpoints on late and on-time invoices.

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Use the received, ready, approved and paid dates for the same invoice. Missing dates stay missing; do not guess them.

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This invoice spans 33 calendar days. These intervals include waiting and other elapsed time; they do not measure active work.

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In this synthetic sample, preparation differs. Approval and payment medians are the same. This points to a question, not a proven cause.

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Check the original records and the people handling those cases. A missing purchase order is one possible explanation to investigate.

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Choose a cohort before interpreting it. Keep limitations visible, then take the specific question to the next investigation.