It was funny, but agreed that dragged on a bit. Plus, my mind thinks of how that affected future things. If they had ended 5 seconds earlier, Hop and Joyce would've cracked the code earlier, gotten the box, and then turned the keys before the evil Russian got in there . . . saving both Hop and Billy from destruction (although not sure if Billy was completely rid of the monster and we don't know what really happened to Hopper, though I like the theories on here).
Of course, even leading up to it I knew they weren't going to be able to turn the keys without interference. Was a little predictable to have him say "on the count of three" and then the Russian intervenes right before.
I really enjoyed the season, just rambling on that one thought I had about the song and how long it was.