What percentage of your upvotes would you estimate occurs after, say, 24h have elapsed since you gave an answer?
My impression is that this percentage is very firmly in the single digits (~3-5%) in my case.
However, when I started out on CV, my understanding of this site was that it aims (surely among other things) to become a repository of answers to common questions which would be seen and appreciated by other readers than just the OP. Whether or not that is the case is not easy to say, but if it is, that does not seem to translate into upvotes that occur after a question has disappeared from the top of the stack of active questions.