In the wild it isn't wet 24/7 where these guys live. Misting shouldn't be your only way of sustaining humidity in the enclosure you keep your animal. Unless you have a sealed or very low ventilated enclosure it will be very very hard to maintain a steady humidity.
So best bet, maintain the room at a high humidity 60% or greater and use the misting as a hydration method.
It's just good 'rule of thumb' to say that the cage should dry out between mistings to have a good swing in humidity that isn't harmful.