ive left them overnight with no problems,
quick clean = blow the atomizer out into a paper towel couple of good blows by mouth from both ends to clean it out, new cart and away you go!
once every week or two i overnight soak them in hot water and stand to dry, ive only lost 2 attys in the 3 months ive been at it
standard Joye 510 atomizers are very durable, use until vapor production is halved, if they dont perform after overnight soak and drying, replace them, i keep atleast 5 extra atomizers on hand.