I have a quilt that was finished in 1949. It has been loved and used for most of 60+ years. It has been washed at least twice per year. The only thing I have had to repair is a small hole a dog chewed in one block. This quilt was hand quilted.
I also have some machine quilted placemats that I bought at a craft market. The quilting on these started to come out after the first washing. I just figured the person that quilted them used some very bad thread.