How often should/would you service Shimano Dura-Ace hubs? I am talking replacing ball bearings, greasing and adjusting the hubs on a C50 7850 Clincher wheelset. Never ridden in a rain nor has it been thru any pool of water. It rolls smooth right now, but I am a firm believer in regularly scheduled maintenance. And I paid a pretty coin for it too, hence the anxiety about maintaining it regularly.

Thanks for all responses.