It all depends on the size of the box and the amount of gel you put in.... Bigger boxes needs more gel and more frequent replacement of fresh gel. Do note that such gel are carcinogenic... cancer causing agents...
yeah saving up for one.. in the mean time I'm using this to store my cam.. hahaha..
ok i found out the problem already.. hehe.. placed more silica gel into the box and the RH dropped to around 50%! quite happy for now! haha
if u want the RH to drop fast, use thirsty hippo. there are diff sizes to cater to the size of ur box. But try to use those sachet ones as the box type maybe too dry... My sachet had been used for 5 months liao still can maintain RH about 45-55%. I open my box about once a week. But in the long run, like what most will say here, get a dry cabi to save ALL the trouble... just my 2 cents.