This is a one-off situation. I've build a bunch of AWS scenarios intended to be a proof of concept, but am now in a position to bill the client for the time spend on it.
Under normal circumstances, (i.e. in production), I'll be using an AWS Cloud Trail to have this info readily available. But since it was not configured from the get-go, I was trying to determine if there are CP specific logs with this data.
Alas, I'll have to estimate time spent on the project without supporting documentation, which I really dislike doing.