What is the maximum number of days an audit can be conducted on-site with a single auditor?

The maximum number of days an audit can be conducted on-site with a single auditor is established as 10 days. This duration is typically determined by the standards and guidelines set forth by auditing bodies, which aim to ensure thoroughness without compromising the quality of the audit due to potential auditor fatigue or diminishing returns in the effectiveness of the audit process.

An audit that extends beyond this timeframe with a single auditor may lead to inefficiencies and increased risk of oversight, as the auditor could become less effective in their assessment. Therefore, limiting the on-site duration to 10 days helps maintain a high standard of audit quality while ensuring that the auditor remains focused and productive.

Other durations listed could suggest either an insufficient timeframe that may not allow for a comprehensive evaluation of the subject matter or an excessive length that could hinder the auditors' effectiveness. Hence, 10 days strikes an appropriate balance between thoroughness and efficiency during an HSE audit.