A few of my quilts were made nearly 30 years ago, I only took them off the beds when I wanted a new quilt or had a request. I made my son a black/bright blue Double Irish Chain when he was 10 or 12, he used that quilt, taking it to the beach, and every time he left home he took it with him (sometimes my kids were boomerang quilts) and he was using it for possibly 20 years, even though the poly batting had thinned out . The very first quilt I made for our DD is about 30 years old, although it has not had a lot of use, but she is planning on passing it down to our DGD at some time. Some of our ancestor's quilts have lasted generations, so I don't think there is a number on how long a quilt will last.