Footnotes:

The repair service has a timeout of 4 minutes. That means if your file is not fixable in 4 minutes it cancels the operation to free up processing capacity for others. Analysis of our data has shown that almost all (serious) files are fixed within 4 minutes. In case of a timeout the most likely cause is that your model is far from a closed shell and the better approach would be to manually fix it in a CAD package.