Depends how much prep they did beforehand. Lots of businesses have contingency plans for negative situations including needing to leave AWS, and they're far less likely to get booted. I’m not sure why they didn’t just start with Epik; they already host Gab and won’t give a crap about what Parler does.

FWIW the Parler CEO claimed 12 hours, an obvious falsehood, and that’s now being used against him in his lawsuit against AWS.