I think most people use sphagnum moss for humid hides. As for when to change it, old/bad substrate has a pretty distinctive look to it (at least to me) if the snake pees/poops on it, or when it starts to look grimy it's time to change it. I don't have much experience with mosses due to living in such a humid area (the humidity here today was over 90%!) so I can't give you a time frame but I'm sure other people will chime in.
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