How often to use a 0.5 mm Derma Roller?

Hi Y'all. I have started using a 0.5 mm derma roller on my face 3 times a week. After just doing some research, I've no idea how often to really use it. Some sites say, for this depth of needles, you can use it 2-3 times a week, some say once every three weeks, some once every 4-6 weeks, and some say you can use it every day! I understand that if you reach the dermis (which this depth does not), you need to wait 6 weeks or so before doing another roll. Please, kind Doctors, answer this for me!!