Pumping for twins

Any advice?? My twins are just over 6 weeks and I am going back to work in a week and a half. When I’m there I’ll get three 20 minute pump breaks, but I’m wondering if I’ll be able to produce enough in that time to feed them both for the following day. So far I haven’t pumped a whole lot because of their schedules and timing it out and I’ve been lazy 👎 anyone have experience with this? I nursed my older daughter for 18 months and pumped at work until she was a year old. I am just hoping/wondering if I can make enough in that time to feed them both