10 Minute time logging, ROLLING or STATIC?

So watched the video, read the PDF still not clear. Just looking at the forums here Bentley could be doing a better job at this. or just do what every other software vendor does and offer hard limited licenses. 

The way the video, and the PDF explain the 10 minutes usage its not 10 minutes. its any usage that crosses a 10 minute border.

That is:

Start at 1:01 and close at 1:09 Not counted.  8 minutes of use not counted

Start at 1:08 and close at 1:11 Counted. 3 minutes of use is counted since it crosses the 1:10 boundary. 

What would make sense is that the 10 minute boundary is dynamic and moves with the user, such that,

Start at 1:01 and close at 1:09 Not counted.  8 minutes of use not counted did not cross the 1:11 boundary

Start at 1:08 and close at 1:11 Not Counted. 3 minutes of use did not cross the 1:18 boundary