Intraday range says how far the stock has gone up and down in the last 2, 5, 15, 30, 60, or 120 minutes.

The range is the difference between the price of the highest print in the time frame and the price of the lowest print in the time frame.  There is no special filtering for unusual prices.  One single print can make a big change to the range.

You can filter based on the exact size of the range in dollars.  Or you can filter based on percent.  If the current stock price is $10.00, and the range for the last 30 minutes was $0.10, then you can also say that the range was 1%.

For most of these filters the time is precise to the minute.  At exactly 10:30 the 30 minute filter looks at all prints between 10:00 and 10:30.  59 seconds later the server still starts looking at 10:00 and ends at the current time.  1 second after that, at 10:31, the server looks at all prints between 10:01 and the current time.

The 2 minute versions of this filter are precise to the second.  Otherwise these filters work just like the longer term ones.

These filters work before, after, and during normal market hours.  These filters are available any time that a stock has had at least one print during the specified time frame.