The import system can takes several hours to process data.
When you import a file with 1.000 URL inside, wallabag crawls the 1.000 URL, one by one to get the webpage content. Then, wallabag cleans it to keep only what is necessary.
That's why it can take time.
But you can still use wallabag and save new articles during the import.
So don't start the import twice (or more!) and just be patient!
If the import is not finished after 2 days, contact us at helpdesk@wallabag.it.