[Plugin: ?Time plugin?] Hard to find

hi ..

i have for some time tried to find the best time plugin for WP.
but so far no luck. have also searched in here. alot.

i am looking for a plugin that can give the total time used by each registered user.

and that can give a top 5 of the 5 most active user. by their time used in total.

i can find program that can show most pages seen, most logged in. and so on.

but i need one that shows each users complete time used and can give a top5, top10 and so on.

thz.

and the time stat. do not nessary have to be in real time. but ofcause there should be an time update every 15 minuts. as a minimum.