As someone with a little insider baseball knowledge, it was just a few hours down of DynamoDB and DNS. However, that caused EC2 to go down for ~1 day, which causes pretty much 1/3 of the internet to go down. Once EC2 sorts themselves out, then teams/companies (almost all amazon services use EC2 in the back end) that use EC2 have to get their ducks back in a row, and that can take any span of time, depending on how well their code was written to handle failures + how many people they are willing to pay oncall/overtime.