Apple pencil tip wear

Ive been using my apple pencil for almost 2 months, and not a lot. I's say maybe 30 minutes a day. I have a glass screen protector and i expected it to last much longer - is there any thing i can do to minimise the wear? Its only worn down on the tip - i can only use it straight on as i does not respond if i hold it at an angle. When should i replace it? When it stops responding entirely? Or when i can see more of the metal inside - i can only see a tiny point worn through right now.