Over supply breast milk 10 days pp.

I exclusively pump and have to do so Atleast every 3-4 hours or else I hurt. I’ve been icing my boobs. I have to pump for Atleast 30 minutes in order to feel comfortable again. One boob let’s our slower than the other so I have to pump 5-10 minutes extra on that particular boob. In 24 hours I get 60-84 oz. hat should I do to produce less to make this easier? I’m getting tired of having to pump extra throughout the night and wasn’t planning on pumping for long term. When I go back to work it will not be possible to pump every 3 hours.