I don't really think there is a good answer on how often you should mist/fan.
I have heard that a perfectly made monotub requires nothing as it maintains its own climate (humidity and FAE). However with my own, I usually mist and fan once in the morning and once at night. I could be wrong, but you sort of just need to figure it out for yourself.
I would say the biggest thing that decides it is how the substrate looks. If it is dry, you should increase misting. In my own tubs, I know the humidity is good if there is condensation on the sides of the tub and a little on the lid. I know the humidity is too high if there is a ton of condensation, leading to water droplets, on the lid. I mist the substrate directly, but hold my sprayer about 2ft above it so a light mist falls down NOT large, heavy droplets. If you spray the sides of the tub, it is basically impossible to know how the humidity of the tub is. I will increase/decrease misting depending on the condensation I described above.
Just have to eyeball and apply patience. Penis Envy takes forever but I promise it will pay off:)
Edited by LegoMyego, 17 April 2019 - 08:55 AM.