tunise I don't think they can, but you may have to do some research.
My Routine: To start I expressed twice a day, and fed her just before I left and as soon as I got back. Over time, I wasn't bursting when I got in and I just slotted in with her routine more. Would get out 9-13 oz
Now at 7/8 months, I express once at work (6-7oz) and when I get in (or an hour after feeding her) to get out another 1-4oz.
This has and still allows me to express a little more than she takes, then if she eats more if doesn't impact stock. If we had built up some over the week, then DH would feed her on sat morning to give me a bit of a lie in.
LOs Routine:
Before weaning DH would offer her 1oz/hr as otherwise she would just eat whatever she was offered. So day 3 hours since last feed would get given a 3oz bottle. If she cried for more, then she was offered an oz at a time. This meant that I didn't have to worry about expressing loads, and she could catch up in the night if needed.
Now she gets offered 2oz a time, but is on 3 meals a day. Really playing it by ear.
Pumps: It depends on how well you express. I can say that having a double (I have a rental, but that's provided by work) is loads easier. The manual can get tedious quite quickly, but there isn't much increase output with the electric and hospital ones (Well for me anyway). The double one means you can be quite hands free to do some reading or relaxing. It's not like they're hard or long to get, so if you want you can just see how you get on.
Before work: I fitted in a couple of expresses a day, just to build up my supply and put some in the freezer. I avoided giving her to LO, as this wouldn't then increase my supply. In the beginning, I would have booster session at the weekend to try and increase supply if I felt I was expressing less at work.
normal (after 6 weeks). range of milk that bf babies have is 25oz (19-30) and this doesn't increase with time.
hth