If you drive REALLY hard then 14k may not be too unreasonable.
One thing a lot of people forget is to check the adjustment on the bearings after the first few hundred miles - it's not uncommon for new bearings to bed in and/or pull in the last bit after a bit of use. This will cause a little bit of play that will drastically reduce the bearing life.
I also like to pack a heap of grease into the new bearings before I fit them. Quite simple (and enjoyable if you liked playing in mud when you were a kid). Place a good dollip of grease in the palm of one hand and rub the bearing through it so that the grease pushes into the housing. Can be very supprising how much less grease you have in your hand after a few minutes. I never trust the small amount that is in the bearings when you get them - I grew up on a farm where the moto was if the machinery part didn't move then paint it, otherwise if it moved cover it with grease - a lot expensive machinery would sit idle for most of the year to be dragged out and used for 16hours a day for a week or so in hot dusty conditions - and if it broke down you were in deep do do.