Why does it take so long for a repository or local add-on to show up in Add On Store?

I’ve added two non ‘Official’ or ‘Home Assistant Community’ Add-ons recently, one a Local Add-on (hello_world copied from the Add On Tutorial) and one a custom repository (Slacker Labs’ SDR2mqtt). In both cases it took over 12 hours for these to show up in my Add On store. What’s going on? Is there a setting I need to make to speed this up?

I’ve clicked “Check For Updates” I don’t even know how many times. I finally give up and the next day they ‘magically’ appear.