i had a 5lber and it was gone in about a month...but i also had corn down so deer were really hitting it hard...and it rained a few times during that month so that helped desolve it but it was normal rain nothin marjor that isnt normal...i wouldnt think a 25lb would last much more than 6 months or so...less its really dry and deer dont touch it...i set it out one evening and came back the next afternoon and i could see where a deer licked on the edge of mine..all depends really...it could be gone in a month if it rains constantly...