The actual thing I guess is the application actually running in the background, isn't it? coz symbian's multitasking way is nothing real like n900, again isn't it? and I guess samsung is using the same way.. but I can be soo wrong ...
My N900 running at 850 ulv kernel from titan gave up after opening 26 apps with actually running apps like - conky, media player playing music, bounce and angry birds playing its home screen things, maps and not sure about others - 3 web pags etc.. However, the cpu wasn't 850 all the time and had to manually restart the device i.e take the battery off

BTW ya the test is completely pointless as I dont think anyone will use that many apps at once not even in computer and not even in a week