Hey Duders

About 2 years ago I first got interested in Lucid dreaming. I read a few things on it and like most, got frustrated and gave up after a week. But something about lucid dreaming kept drawing me back in. I tried again and actually had 10 or so Lucid dreams over the course of a few months. My dream recall is pretty good, and so far Reality checks have been the only thing to work for me . Now that I'm gonna give it another shot I need some help with my biggest problem. After I realize I'm dreaming, I have 20 or 30 seconds tops before everything fades to black and I lose lucidity. I've tried looking at my hands, spinning, focusing hard on my surroundings but nothing has helped.

Any advice?...please?