Doc Nock, They were used only once a year for our invitational shoot. Like most 3D targets today the larger ones lasted longer than the smaller ones. We kept them stored out of the weather most of the time but eventually the weather got the best of them before they were shot out. Rain played havoc with them. The ones that had legs with only heavy cardboard for support would eventually give out. Arrows were difficult to pull but we solved that problem by rubbing bar soap on the first 3 to 4 inches of the arrow. That made pulling them much easier. Everyone carried a little bar of soap like you get when you stay at motels. The bear is the only target we still have and we use it once a year for our 3D invitational shoot. It is no longer a Grizzly but has been painted white and is now a Polar Bear. I noticed at the last shoot he was used he is beginning to really show his age. The stand and legs are starting to give way. He had plywood for support in his legs and the plywood is beginning to delaminate.
Oh, and by the way the bar soap thing works on todays 3D targets as well. A little soap on the end of your arrow will make them easier to pull.