It takes a minimum of two weeks, and often longer, to get a coin listed on Coinbase. The process starts with an application from the team behind the coin. Once that is received, Coinbase conducts an initial review to determine whether the coin meets their listing criteria. If it does, they then launch an in-depth review process which includes things like a legal review, an engineering review, and a security review.
This can take several weeks or even months to complete. Once all of that is done and the coin is approved for listing, Coinbase then needs to integrate it into their system which can take another week or two. So all in all, it’s a pretty lengthy process!.