How many times a day should I pump? Help plz

I know putting baby to breast helps with stimulation and milk production but my baby rejects the boob so I have to pump my milk. But I was wondering how many times a day should I pump? Lately I’ve been pumping twice a day. Cause I start leaking 2 times during the day.

Any advice with pumping or helping produce more milk would be very much appreciated. Cause my LO is 6 days old and he’s already drinking 1-2oz of milk every 1-2 hours and I am only able to pump 4oz a days.