I launder a quilt at completion- final step after binding- after that my quilts only get laundered when it’s needed- if something get on them, or if they’ve been out/ used and I’m going to store them. I launder before putting away. ( folded and stored in a pillow case in my trunk ) when I take them out to use I just air them before putting on the bed. So, used quilts usually get laundered once a year- when I’m switching them - non used quilts don’t need laundering.( I have our summer quilt, fall and winter- so they get switched out with the season, laundered and put away. )