What is the longest checkmate puzzle you know?

I found a checkmate in 113 moves, by cjxchess17 which I found very interesting, and it is the longest checkmating puzzle I have ever seen (not including known endgames).

Here is the link to the video showing the mate in 113: https://youtu.be/rRjgB4HdFSM

What is the longest checkmating puzzle you have ever seen (or maybe even made yourself!)?