Bottom bracket is dependent on so many things that it is hard to say how long one will last... I seem to be getting 15000 - 20,000 km out of Shimano cartridge bottom brackets but am pretty light and spin more than I mash.
My old cup and cone bottom brackets seem as if they will last forever with regular service.
Have been test piloting some of these Neco bottom brackets and have not experienced any issues with them... they use a standard sealed cartridge unit and run out quite smoothly.