How to tell if blades your blades are dull? After how many skating hrs do you get your skates sharpened?

I get my skates sharpened about every 1 or 2 months. and I skate 5 hours a day on my skates. I guess it really depends on how they feel to you. I know some people who get them done every 2 weeks. You can tell if they're dull by scraping the top of your finger nail perpendicular to the edge and if a small shaving of your nail comes off then they still have sharpness to them. if not you may need to get them sharpened.