Urriak Uruk
Gaming is fun, and fun is for everyone
Don't forget
Ghosts of Saltmarsh: 1-12
Candlekeep Myateries: 1-16
I'd be cautious about overgwnralizimg the average, as it looks different if you look at just Advebtures published since 2016 for instance: only Dungeon of the Mad Mage and Candleskeep are over that average in the past 5 years, and I do recall Perkins commenting that 15 was generally on the high side in terms of market demand, which is why they shifter focus a little bit downwards.
I knew I forgot some... average doesn't change though. I largely agree however that they're more likely to end adventures at 12 or 13 instead of 15.