it depends i skate every week for 5 hours 3 traning sessions and i am a goalie i sharpen them mabey1s a mont but my freands say once every two weeks

just get your nail and run the back of your nail on one of the edges and depending on how much nail comes of is dependent of ho much sharpening you need

its really a personal thing you need to get your skates sharpend when you think they need it but dont do it to much becouse you will ware the blade down.

__________________
Yahoo! 4ever