Do it for as long as it takes. The planning, the preparation, the commitment, and the right attitude are absolutely essential. And so is the action. The courage and discipline to act on your dreams, will make them a reality. There is no other way.
Comfort accomplishes nothing.
Anything worthwhile requires real effort. There is nothing that can equal the satisfaction of accomplishment. Of using your mind and your hands, and your sheer will, to create something that has never existed before. It will happen when you act on your dreams, step by step, day by day, again and again until the job is done.