group timings again


I’m a bit puzzles about the timings given in following report. The group says every thing lasted 54 435 ms, however, if i add up all the max values i only get at
13 401 ms. Where does the difference comes from? Since there was only 1 user that walked to the scenario once, the total of the group should be at max 13 401 and probably even faster since resources are fetched concurrently.

Can somebody shed a light at this?