I understand what you're asking, but there is no real answer to it. In real world programs, variables are created, changed, compared and deleted all the time. The frequency at which you change variables all just depends on what program you're actually creating. Some variables make require to be constantly changed to suit user needs, while some can just remain as a constant. But if you need to change a variable, you change it. No worries about how many times you're doing it.