Really going to have to go with Michael on this one, I don't think it matters how long you leave beads in a humidor they aren't going to season it, if anything wouldn't the humidor lower the RH set point of the beads, the fact the wood is absorbing the moisture and not releasing it ... ?
Also, beads are only effective to a certain point, I believe it's something like the top 2" of beads are about the active depth, most likely anything under that isn't really having too much effect on the RH, this is why people tend to put them in bags or in the tubes, so you get more active area out of your beads and not just the top couple of inches of them in a bowl. Before I had the bags I would actually cut the lid off a cigar box and fill that with beads and pop it in, that way the depth was only two inches and it was a wide surface area.
I am by no means an expert and again just my
