It took 2+ months for our extension update to be approved, it was a small incremental update. Getting it done in that time frame required us to email Caitlin and an HN'er who commented on another thread to try and get things done in an expedited manner.
For a time there was a little ticker showing your place in the queue. We graphed that for a while, then they pulled the feature entirely: https://twitter.com/preinheimer/status/1422577415780450311
The queue of course isn't a straight queue. Some people end up traversing the entire queue, very slowly. Other folks manage to jump out of the queue and get listed sooner.
We've seriously considered abandoning our FF extension. FF's market share is shrinking, and we see the difference in the usage stats for our extension specifically.
Some of our updates require coordination on our website and the extension. So holding onto FF means that some updates take months to roll out for everyone.