long puzzle

5 moves
lichess.org/training/114504

Here is one I just solved and really enjoyed that is six moves long:

lichess.org/training/100697

2431 rating, at this moment.

Very good!☑

I'm a good chessplayer!!

This is 12 moves at least:

lichess.org/forum/game-analysis/a-muddy-puzzle-fortress

That's a great puzzle.