Invariance predicts business time to unfold at a rate proportional to the 2/3 power ofthe product of volume and volatility. Define a “switching point” as an investor changing thedirection of trading. The number of switching points is a good indicator of the business timepace. We calculate the number of switching points for each stock for each month for theSouth Korean Exchange. The estimated exponent of 0.673 validates invariance predictions.Discrepancies either result from trading related to index arbitrage and creation/deletion ofETFs or show up outside of KOSPI 200 universe