A cycle timmer cost about 90 bucks. You can vary the time from 10 seconds on up to 60 min on and the off cycle varys from 30 sec off to 60 min off. A good misting cycle is 30 sec on every 5 min. That will give you an RH around 70-80% during the veg cycle. For flower you don't use anywhere near that level of RH but for vegetation is kicks ass.