I didn't 40 hours over 5 days for
When DD was 4.5 months old (before mat leave increased) and she went to nursery. She was still mostly bf, but we introduced mixed feeding bottles (some formula, some expressed). I was able to pump at lunch daily at work and use that next day for Creche.
Ruthless organisation.
Empty out the bag and refill asap when you get in at night (changing clothes, adding nappies, emptying bottles and refilling formula container - the bottles. Of water or milk were sorted later etc).
Try and leave dinner either cooking on a timer or ready to just turn on and Cook when you get in - prep veg etc the night before and do some batch cooking like slag Bol, chilli, curries etc when you can for freezer ( I do a double batch of something on Sundays for Monday and freeze the second half for another night next week).
Lay out clothes for you both the night before. Lay out breakfast things too. And make any lunches you are making and pop them I. The fridge overnight.
I got to 10 months morning feed and dream feed before we dropped bf. (I went back to uni and got too worn out). Give yourself enough time in the mornings for the feed, and either get dressed but pop dressing gown over you, or do it before getting yourself dressed.
Invest in a travel mug too, for a hot tea/coffee while commuting and keeping up the necessarily fluids.
It takes organisation but is perfectly do able!