Most people say that you should spray for 20 min. (so they can clean their eyes etc.)
It's okay that it gets wet-- they like to lick water off the leaves.
Most people recommend that you let the cage dry between mistings.
I don't know how many people would recommend this--- but I usually leave 1 corner dry-- He usually hangs out in that corner everytime i mist licking up any spray that comes near. Then when i leave the room ( or try to hide) he roams around licking the leaves.