I set my system to water the cuttings every five minutes for a period of seven seconds. After a period of four or five days I change the settings. I then go to ten minute intervals and stay with a seven second spray of water. Using intermittent mist propagation sounds much more complicated than it really is. However, it does require an investment in equipment and the proper controls.
Intermittent mist is fun because the cuttings root so quickly.
Some plants will start showing roots in about two weeks. I love propagating with intermittent mist. It amazes me. It is so easy, it is almost like magic. You stick the cuttings in the sand, turn on the mist system and walk away.