The measuring period within your charging time frame. Charging Time frames are usually a calendar month. Measuring periods can be anything, but would normally be a single 24 hour day. Which means that the charging period would contain 28 to 31 measuring periods. Now lets put it together and see where the problem lies .
Lets take the example of an often seen web package.
So, your charging period is a month - say 31 measuring periods of a day each. You put together the page we used above - 10k index.htm and 2 pictures 5k and 12k for a total of 27k bytes. After advertising your page in the major search engines you check your traffic, as shown on your webcounter or reports. Lets take 4 different amounts here for comparison purposes. We will also assume for this exercise that each person through only accessed the site once, with no reloads.