DD is 5mo and exclusively bf. She'll take a bottle of expressed milk if she wakes up in the evening, which is rare, but comforting to know she can do it.
So far, I've expressed by hand first thing in the morning while she feeds from the other side, but my supply seems to have sorted itself out so I don't have any 'spare' any more. I don't wake up in wet patches and fit to burst at any rate
. Used to get about 5/6oz like this, now more like 1oz if I'm determined.
I've spoken to work and said that my plan is to continue bf when I return in Jan. Am going in for a meeting next week to figure out the finer details, and it would be really useful to have a better idea of how this will work, so I can go armed with the facts about having time during the day to express.
By then she will be weaning anyway, but presumably will still want a fair amount of milk? I'll feed morning and evening, but she'll need milk for during the day.
So, do I invest in a pump? Will this get more out?
How often will I have to express for to get enough milk to last the next day? How much milk does a 7mo have? 
What pumps have you used?
Or is this a complete non-starter and should I just try and get her to take formula during the day and bf when I'm home?
Any advice would be really greatly appreciated.
TIA