At best it would be a statistical average that doesn't help much with an individual situation. I've seen vapors super saturated for many minutes and miles down a pipe. I've also seen condensation prior to the dew point. Any of these numbers are useful averages for a population, and individual results may vary. If I know that a gas stream cannot stay super saturated forever, then I know that I have to deal with condensation. If I know that it can stay super saturated for a while, then I know I have to deal with condensation in the gathering system. Much more than that and you are working outside the accuracy of the calculation.