Every baby is different, it is normal for a newborn to feed for an hour every 3 hours, or to feed for 10 minutes every hour. It varies so much. Just feed on demand to begin with, your baby & your body will know what's best, just go with the flow.
I started expressing at about 4 weeks, I now usually pump 2 feeds per day (I do it at the same time every morning so my supply isn't affected), so OH can give a bottle last thing & I have a good stock in the freezer for days when I have to work.
Good luck, breastfeeding is hard work to begin with but so worth it.