I took three over with me when I went Europe in Sept., left two in Switzerland and one in Germany. It has been lots of fun seeing people go after them and grabbing them from one another. One I put in a 4/4 cache in Switzer. and it stayed there for about a month it was picked up and moved about 2 miles in to a 5/5. I imagine it will be there for a while its in an underwater cache that you have to take a boat to GCK6E1.