What if you applied this concept to your work life? What if you needed to set up your department or business for someone to take over in 30 days? Would you finish that project that seems to keep lingering over your head? Or maybe you'd finally have that conversation with that person who isn't performing so well. Or maybe you'd develop a new process because the old way just doesn't make sense anymore.
A common theme in life is that we're so busy putting out daily fires that we don't get to some of the tasks that have most meaning and impact. Try the 30 day challenge: make a list of those "shoulds", develop a step-by-step plan to tackle them and get to it. Soon those voices in your head will stop saying, "You should" and instead will be saying, "Well done!".