Doing the maths here and it looks like I only have enough milk for 5 days :o(
So... after actually starting this morning, it looks like I'll have 3 more normal food days and then start with the milk on Monday. It means that when I finish the 5 days, the next lot of milk will be ready for collection and I'll be able to continue and do at least 7 days straight.
but better than only figuring it out a day or two from now?
(and starting was heaps better than I thought it might be... I don't usually start my day with milk! I might from now on though)