The pinned "Unofficial search and indexing FAQ" on this board covers it, and the short version is that it isn't a separate queue for posts. It says a devlog marked as a Major Release or Update gets reviewed by itch staff, and that the review queue is prioritised by, quoting it, "genuine traffic to the game page coming from outside itch.io".
So 14 hours isn't a fixed backlog you can wait out. The FAQ's own advice is to share the link off site, because pages with real outside traffic get looked at sooner.
A data point from the other end: we post devlogs regularly from an account whose games are already indexed, and those go public straight away, loadable signed out inside a minute. That gap points at the review queue rather than at an approval step every post has to pass.