loose bearing last a long time ,if they are installed to tight they fail. If the grease they get a good hand full of high quality grease and repacked every year or so they don't need any other work . Don't give them any extra grease during the year , chances are its just going to get on your brakes.
Mark & Melissa
2015 Redwood RL38 , Kodiak disk brakes , 17.5" tires , 8K Morryde IS