Hi 4space,
It is okay to do qigong, in the way you asked about.
I enjoy an early morning session, then again at noon. In this sequence, I feel the benefit of my morning practice, amplify my noontime experience. It feels great, and is the most powerfully felt. It isn't just that noon is such a good time. The earlier session effects the second session. I really feel good. Things are moving.
I also do something later in the day. It is more toned down, and is a very relaxed, a quieter feeling of satifaction, solid accomplishment, and also a bit of reflection on the day. 'It can follow the energy of the day.'
We all lead different lives, and your qigong practice can balance with that. I find it very good, that there is alot choices of what to practice. Different active exercises, and different meditations. Within that, do what you feel like doing. Outside of formally setting aside time, you can do brief egagements with things throughout the day, and also, work on your level of awareness, all the time.
Regarding time limits to practice. The best I have ever felt, is after a retreat. That, involved me in 'several' hours a day of practice. I made great gains. This is not possible for me to do all the time, as I have a career and family life. I fancy the life of a monk. It is not for me in this lifetime, but it certainly has its attraction. I know of no monks or anyone who practices extensively, even removing themselves from the outside world, exploding or imploding, over doing too much energy work.
Being a healer, for instance, would be a great lifestyle. In essence, you would be engaged in focused qigong work for a great deal of your day. Also, receiving great benefits from that.
-Maintaining a balance, is always involved in any self practice, or healing practice.
-It doesn't take 30 minutes to clear blockages with qigong.
-Qigong is not only about clearing blockages!! It is just an exercise either, or, set of exercises. Do you not see the benefit of engaging with a practice that brings greater wisdom, and awareness? Knowing the truth to things? These can be just words , or fully self realized source energies, that keep expanding, in how you perceive them.
Although the material deals with self healing,or healing others, this is just one facet of qigong.
-It is a practice of self realization too. You are not just a body, or a body with blockages.
Qigong, in a purer, more grand definition, is a natural state of being. It is not an hour here , or an hour there, removing blockages.
It is a way to be, a knowing, an awareness. It is an alignment with truth. It can bring one to the reality of who you are, and the eternal aspect of who you are. Sit in it. Spend all the time you want doing it. Do it formally as a session, do it in a thought, or moment. Do it all the time. Soft, hard, long, short, inside, outside, early, late,physical, spiritual,,,,make a balance that works for you.
Sessions are good checkpoints and mini retreats during your day, to regenerate, energize, purify, rebalance, release, rerealize, etc... Make time to create these 'dots', then connect them.
love,
gallen