Defining real-time while using the System Tester

When running the Enhanced System Tester on real-time data, is the number of periods equal to the x-axis periodicity? If I specify 1000 periods and I'm viewing intraday at 1-minute, will the test be run on the last 1000 minutes?

For all practical purposes, Yes; it will be 1000 minutes.  But, let's be more specific here... Let's imagine a formula where I back test over 1000 securities in real-time. If it was possible of course, the System tester would use what you have in cache for its calculation which means that if it takes an hour the first 100 securities will have used the 1000 minutes from an hour ago and the last securities will have used the last 1000 minutes.