Your MCHN should be able to give you some idea of how much EBM would be enough.

Do you know roughly how many feeds Makon will be at Childcare for, and does he have a pattern where you know/suspect he feeds more at certain feeds etc?

i.e. Milo appears to get most of his b/m in the first 2-3 feeds, and then cluster feeds in the evening

If I'm still breastfeeding (fingers crossed I wil be) when I go back to work in June I guess I will be looking at this issue too.

Also, I'm not sure how accessible childcare is in your area, but if you're lucky enough to have one close to your work, ad the work schedule to allow it, you can usually arrange to go in for at least one of the feeds & breastfeed him there.

good luck