Surely you are right about being uncomfortable at first and once getting used to it and pushing your limits it won’t be discomforting anymore. It works like that with many physical activities. But ask yourself to what purpose are you trying to stand on your head for longer periods of time?
Your main goal is to be happy right? If you believe setting a goal in your mind which revolves around doing a headstand for a longer amount of time, while worrying what is right and wrong will make you happy, feel free to set a mark and go beyond, and once there set a new mark and go beyond once again.
But what are you trying to reach, what are you hoping to attain? If it is fulfillment you are looking for, just know that striving doesn’t help much, nor does a headstand.
That is why I said 2 1/2 minutes are enough. Doing it for 5 minutes won’t fulfill you either, nor will it make you healthier. But the latter is just my opinion.
If you wish your actions to be in harmony with your body and the natural order of things, than this is my advice:
- know why you are doing what you are doing
- if it is out of striving to be better in order to feel fulfilling, don’t push your limits because than your egoistic state is forcing things and may cause harm to your body, which is unnecessary.
With that, do as you see fit.
After a few visits with different docs all saying the same thing - basically, “Why? Is there something else you can do to achieve the same benefits?” I changed my practice to include other inversions that I hope will bring me those benefits. Handstands and shoulder stands (the way Mr.purna teaches them, lots of blankets to preserve the cervical curve) have been working quite well for me.