How long can I view the closed tickets in Tickets list page on Business Portal?
For a month from the closing.
However, you can search the tickets closing over a month in the past from "Search Tickets".
How to search the past tickets.
1. Log in to Business Portal and log in to Smart Data Platform Portal.
2. Click "Support" on the right of the above tabs on Dashboard.
3. Click "Move to ticket system" on the field of "Inquiry through ticket system".
4. Click "Search Tickets" from "SERVICE DESK" on the above tabs.
5. Fill in "Search Parameters" and "Date Range (Ticket creation time)", and click "Search".
6. You can find target tickets in "Search Result" field.
Reference: Tutorials - Using Ticket System