Drupal Upgrade stuck at 53%

I followed all of the steps to run the Drupal Upgrade, from 6 to 8. It has been stuck for 53% for a few hours now and I am not sure what to do. If I close out, will I mess up anything? And does anyone know how I can fix this and successfully update Drupal? Thanks.

Here is what it currently is displaying above the 53% loading bar.

Currently upgrading User accounts (48 of 88 total tasks)
Continuing with User accounts (processed 64 items)
Continuing with User accounts (processed 41 items)
Continuing with User accounts (processed 48 items)
Continuing with User accounts (processed 53 items)
Continuing with User accounts (processed 60 items)
Continuing with User accounts (processed 50 items)
Continuing with User accounts (processed 63 items)
Continuing with User accounts (processed 66 items)
Continuing with User accounts (processed 72 items)
Continuing with User accounts (processed 64 items)
Continuing with User accounts (processed 68 items)
Continuing with User accounts (processed 46 items)
Continuing with User accounts (processed 55 items)
Continuing with User accounts (processed 72 items)
Continuing with User accounts (processed 59 items)
Continuing with User accounts (processed 59 items)
Continuing with User accounts (processed 69 items)
Continuing with User accounts (processed 66 items)
Continuing with User accounts (processed 73 items)
Continuing with User accounts (processed 70 items)
Drupal version: 


Source: https://www.drupal.org/taxonomy/term/21/feed