[shepherdjerred]

No definitely not. Usually pipelines deploy over 1-2 week periods, and they don't deploy on Fridays/holidays/high-traffic periods like December.

Deployments start off very conservative, maybe 1-2 small regions on the first day of deployments. As you gain confidence, the pipeline deploys to more regions/bigger regions.

A pipeline that deploys to 22 regions over one week might go from 2 small regions on monday, 4 small/medium regions on tuesday, 8 medium/large regions on wednesday, 8 regions on thursday.

us-east-1 is usually going to be deployed to on the wednesday/thursday in this example, but that isn't always the case because sometimes deployments are accelerated for feature launches (especially around re:invent), or retried because of a failure.

There are best practice guides within Amazon that very closely detail how you should deploy, although it is up to the teams to follow them, which they usually do an okay job of.