How often you cut your finger nails?

This question popped out of my mind when I suddenly thought of a friend. One friend of mine has this habit. She always cut her finger nails but she never cut them short instead she cut them bit by bit. Why does she never cut her finger nails short? Because she wants to cut them the next day. Every time when she starts to daydream or thinks of something such as revising notes,she will automatically cut her finger nails. This is a weird habit,so everyday I can hear her cutting her finger nails,lol...So how often you cut your finger nails? Everyday?Every week? Or longer than that period of time?