Issue Summary

After you start the import, the Notion Importer explains that:

This process can take a while. Depending on the complexity, bandwidth, size of the transfer, and other factors, it can take a few hours or more to finish. You will receive a notification email when the import is complete.

There is no time estimate or estimated time of completion. If users don't receive the confirmation email, they can't confirm if the import is complete.

Suggestion

Create a Notion Importer status page that includes features such as a progress bar, estimated completion time, and the export's current status. Additionally, consider including the success/failure messages emailed to the user on this page so they can read it in case they did not receive the email.