I tidy up the place only when I finish a project... but sometimes the project is to complete several WIPs. I like to make a bunch of tops at one time and then do the sandwiching on all of them and then finish them all up, so it may be a while between major cleaning. The feeling of accomplishment is wonderful when I see 5-8 quilts all done at one time!
BTW, they are all baby quilts for donation!