I usually take a quick digital photo of a trail sign like this so I have it to reference when I’m out on the trail. In this case, on a recent trip to the Czech Republic and East Germany. Very nice hiking there!
The trail signs were printed on adhesive vinyl and then applied to their version of DiBond. That gives them a 10 year life.
We prefer to print trail signs like this with direct printing on our UV printers. The life in sunlight is more like 5 years, but often these kiosks are north facing or under a canopy, and you will still get really long life. I always tell people that it’s unlikely that nothing changes over the course of 5 years, and you will probably need to change the trail map anyway!