Looking for a big and difficult pcb file for Fun

[Theboel]

Hi All,

25 years ago I started use PCB software and I remember I need to run autoroute about 24 hours for my frequency counter design.
today I want to try to see a pcb design that need very long time to autoroute to complete. if You have the file (i don't care what is that for) could You share it to me or maybe You can point me where I can download it.

Thank You.
Anton