Case in point: these guys say a 10 meter wire is an antenna, but under 10 cm is nothing to be worried about (under normal circumstances).

https://www.eevblog.com/forum/beginn...54/#msg3863054

My longest wires might not even be longer than 10cm. I'm just starting the I/O Expander circuit (it's going to sit "somewhere" in the middle of a bunch of switches//buttons).