The Powers of Hell get stretched pretty thin at times because of spiritual warfare, but they will still put their asses on the line and come and give messages, protection and inspiration.
Everyone is different, so that is not an easy question to answer. I'd suggest to just do the meditations without expecting to see Satan and his Demons. That was never my goal. My goal, as should everyone else's to be striving towards self-perfection and physical and spiritual advancement.
You may see Satan and his Demons at some point, but make sure that you don't do the meditations with any expectation than to grow to new heights that you never dreamed of.
Another important thing for everyone to know is to take the best care of your bodies as possible. Exercise, walk, jog, run, lift weights, do yoga and the like and make sure that you add plenty of fruits and vegetables in your diet because the physical and mental have an effect on the spiritual and vice versa.
