With Apple, at least in Germany, you schedule an appointment online, you walk in at that time, and you can come pick it up an hour later. Many independent shops offer basically the same for Android and Apple phones.
When I did it two months ago it took them an hour. Be generous and say they’re backed up and sometimes it takes two hours. Is that too long to be without your phone?
i was referring more to this part "Mail-in battery replacement". good to know that they can do this so fast. but it would be even faster when battery would be user serviceable. and not everyone is living driving distance away from certified workshops.