How much time to air:
After cleaning, you can dab off the skin with a soft towel (paper is likely to irritate more than cloth). If the skin still feels a little moist, it takes only 30 seconds to air-dry, and then you can put the new diaper on. You can also softly pat the skin with the back of your hand to speed up the air-drying.
Especially with newborns, there's often no need for soaps, ointments or powders as long as the skin is clean and dry. We use only warm water, and cosmetic pads rather than wipes. We do use an ointment on occasion when the skin is red, otherwise nothing.