Explanation
The Opportunity Stage Duration report is a standard report that shows how long opportunities spend in each stage before they are closed. It can be used to measure the average stage duration for all closed opportunities by grouping and summarizing the data by stage name and duration fields. Using process builder to capture the daily average on each opportunity is not feasible because it would require creating multiple fields and formulas on the opportunity object and updating them every day. Adding formula fields to track stages on each opportunity is also not practical because it would require creating multiple fields and formulas on the opportunity object and maintaining them every time a stage changes. Refreshing weekly reporting snapshots for closed opportunities is not necessary because the report can run on real-time data without snapshots.
References:
https://help.salesforce.com/s/articleView?id=sf.reports_opportunity_stage_duration_report.htm&type=5

Explanation
One possible reason why a manager receives an error when trying to approve a record is that the user in the next approver step is inactive or missing, which means there is no valid user to assign the record to after approval. To troubleshoot this issue, an administrator should check if the user in the next approver step is active and exists in Salesforce; if not, they should activate or create the user or change the approval process to assign the record to another user. Adding a delegated approver for the next approver in the process does not solve this issue because delegated approvers are only used when approvers are unavailable; they do not replace approvers who are inactive or missing. Updating the field level security to view on fields that are updated in the process does not solve this issue because field level security does not affect approval processes; it only affects what fields users can see or edit on page layouts. Reviewing the page layout to ensure fields updated in the process are visible does not solve this issue because page layouts do not affect approval processes; they only affect what fields users can see or edit on page layouts. References:
https://help.salesforce.com/s/articleView?id=sf.approvals_considerations.htm&type=5