I have a total of 4 pacifiers and alternate the usage. I just invested in a UV sterilizer so that helps. To answer your question, if at home, I sterilize the pacifier if it’s dropped on the floor and if outside (e.g. infant care), when she get home, I will give her a clean one and wash+sterilize the one she used outside. Hope this helps.
Hot water might damage the pacifier. I only use baby safe liquid cleanser to wash the accessories and hang to dry on the drying rack. I alternate between 2 pacifiers so that I don't have to wash too often. I didn't buy steriliser
My lo is 18mo and I still steam sterilise all the bottles and pacifier once a day.
i dont think once a day is too often