You're fine, I've had an airlock bubble for a week and a half and I've had an airlock bubble for a day and a half, both beers hit FG just fine and tasted great. There really is non "normal" action for an airlock. No two systems are exactly the same and there are a ton of factors that determine how long or how short an airlock will bubble for, if at all. On the one I mentioned that only bubbled for a day and a half, I got the noob brewer panic after I didn't see any airlock activity after 2 days. So, I popped the lid, just to see what was going on, and there was a beautiful Krausen doing it's thing. that's when it finally clicked, yeah, airlock ativity isn't a good indicator of anything other than there might be gas flowing through the airlock.