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They go when they want/need to go. My Bloods at times have gone months without a movement.

It is also very common for snakes to have a movement after a shed.

The shed process should start with a red belly and then go from a dull haze(blue) skin to clear, and then a few days after it goes clear you should have a shed. If it fails to shed after a few days something is wrong and humidity may not be where you believe it to be.

If you are using an el cheapo gauge hygrometer it is very possible it is wrong. BRB will usually make very good use of having a water bowl in their cage large enough to soak in. Mine loves to soak in his large bowl and has perfect sheds.