How often do you change your needles?
I have read all kinds of things about needles except on how often do you change them. After how many hours? When they break? After how many quilts are made? If you use your DSM to sew other things? When the needle responds as if dull? All or none of these? Or is it pretty much individual preference.
I hate to waste needles but want the best looking quilts my needles can give me.