The recommended practice time is quite long, is that to be able to do it at will or something? See for example this Youtube video which was effective for me today, and this is the first time I've tried this.
Yeah, I think the goal is to be able to enter an autogenic state in under a minute (if you look at the regular practice routine at the end, it is quite short). I've been basically doing the first few exercises from time to time, off and on for a few years, and I'm able to get pretty relaxed in a few minutes. It's been useful to me even without following the practice schedule strictly.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.