When someone is relaxed all over (body, breath, and mind) then she can hold the pose for a longer period of time.
If you need to have your arms to lift them up because you are short of the back of your neck, then you are not relaxed. If you should find it very difficult to hold the pose, then you should go outside and relax. You should only go to the pose when you are comfortable to hold the posture.
If you want to sit up straight on your heels, lean back, and place your hands out in front, then you are relaxed. If you still desire to keep your pose, then you should go to the pose with your chin down. The pose is held by the chest. There is no way to hold the pose for prolonged time. When we are not relaxed, then there will be very little time in which we can hold the pose. In some cases, an experienced practitioner will hold the posture for a longer period of time. The posture must be held every time one sits on the chair. You should not forget that the posture is held after sitting on the chair. If the posture is not held for a period of time, then the posture is not relaxed. But when we hold the posture, then we can sit on the chair for a longer period of time. The practice of holding the posture can be done in a sitting posture also.
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While holding the posture, one should keep the spine straight and straighten and the chest up and not down, but when we are not relaxed, then even a short period of relaxation will not help one hold the posture. In other words, even if one does not know it, it will not help to hold the posture for a long period of time. However, the posture should be maintained while sitting on the chair. If one sits on the chair in a relaxed manner and the legs are crossed, then it will help to hold the posture for a longer period of time.