Fairly sure this is not time-dependent. If it was, a cheap folding hand fan would totally clean your shop - - if only you operated it long enough.
Try slipping a 5Hp 3600 rpm motor onto your box fan. That might get you the differential pressure required to overcome resistance of the screen (= flow). Sleep tight. Sleep cool. Bring ear plugs.
Just in case the analogy is still hanging out there perilously and incomprehensibly, this 5Hp is a bit like breathing. You inhale or exhale hard enough to overcome the resistance of a mask - or the wifey's hand trying to smother you at night.
I'll let y'all debate exactly what and how much benefit the masks provide.