Just a couple of days ago I counted 8 boxes of Switch or PS4 games that I hadn't yet touched. However some of those boxes has multiple games in them (compilations, etc...). So it was actually more like 18 games.
I usually don't have a backlog quite that big without counting my retro games. However, this time it was due to a combination of getting games as gifts, waiting for Limited Run Games to finally deliver what I wanted, and me ignoring my single player games to play FFXIV instead. My backlog would definitely be smaller if not for FFXIV.