The requirement can be met by using a combination of process builder and approval process. The process builder can be used to trigger the approval process when the close date is delayed by more than 60 days. The approval process can be configured to require unanimous approval from the manager and VP of sales.

Preexisting information will remain even if it was over 255 characters if the app builder tries to convert a preexisting long text area field to text area. However, users will not be able to edit or save records with more than 255 characters in that field until they reduce the number of characters. Preexisting information will not truncate, be lost, or cause an error message.

Sales rep B has implicit access to the Account because of the manual sharing of the Opportunity. Implicit sharing grants access to parent records when a user has access to a child record. Sales rep B was not added to the Account team, sharing set is not applicable for private sharing model, and Account was not manually shared.

To have automatic posts on a record whenever a travel request has been approved, feed tracking should be used. Feed tracking enables field updates to be displayed in the Chatter feed of a record or a user profile.
Users can follow records or users to see updates in their own feed. Feed tracking can be enabled for standard or custom objects and selected fields.

To ensure auditing users can access records in the Case_Issue__c junction object, the correct data permissions on related records must be established:
* D. Read-Only access on Case and Issue__c. Users need read-only access to both Case and Issue__c objects to view associated Case_Issue__c junction object records properly. This is because access to junction object records in Salesforce is determined by the user's access levels to the parent records in a relationship.
Steps to configure access:
* Navigate to Setup # Profiles or Permission Sets.
* Select the profile or permission set of the auditing users.
* Under Object Settings, adjust the permissions for Case and Issue__c to at least 'Read-Only'.
* Ensure that users have visibility to the Case_Issue__c object itself.
This configuration allows users to view the details of cases and issues as they audit the junction object records.