Advice on expressing for long overdue day off!

[Daffodilly]

DS is 5 mths and I have the chance of a day out on my own next week. Hurrah!

I will miss 2 feeds in the time I am gone and I am trying to figure out how much I would need to express for this. How do I figure this out as I don't know how much he takes at each feed normally?

He's had a bottle before but that was a couple of months ago and he had 9 ounces for his bedtime feed. He is a big boy!

Why don't you build up a supply in the freezer? It can be defrosted quickly if you use the bags frozen on their sides and none goes to waste

I really detest pumping - so don't want to do more than I have too. Also a bit nervous of boosting my supply if I pump too much (then I will have a very uncomfortable day off!)

Beginning to wonder if it wouldn't just be easier to take him along....