The site will go down(a maintenance site will be shown instead), while the migration is ongoing. I expect it to take 10-20 mins if everything goes well.
EDIT: I thought I would able to move images in the background before the main migration, so that I could avoid having the site down for multiple hours. Unfortunatly after testing the migration, I have found that it is impossible to do. So the site will probably be down for 3-4 hours, since there is about 100GB of images, that needs to be migrated.
EDIT2: Images have now been successfully migrated. Let me know, if any images are missing.
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