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miro_o
amey
The internals will be fine way longer than the bearings, so you don't have to worry about that. When the bearings have to be serviced/replaced however you'll need to to send it to Taiwan or Germany to have the internals recalibrated for reasons I've not tried to understand. Same goes for the SON hub, by the way.
People have reported doing ridiculous amount of kilometers (30k+) before the hub had to be serviced so I wouldn't worry about it if you're doing a bit of touring once a year. Reportedly the SON will go further than the SP before they'll have to be serviced though, but it all depends on riding circumstances ofcourse.