Forgot to say, I feel uncomfortable about them taking longer than 2 weeks to dry but I like to aim for one week. 7 days from wet to dry is a good target, it means you don't have to water every day but the roots dry fast enough that they are not sitting really wet too long.
It's one of those things to experiment with when choosing a medium. If it takes too long to dry then try something faster drying, if they dry too fast and you have to water too often then add something slower drying.
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