I make a chicken last 3 meals too, but that is because the second two meals are pretty much vegetarian meals with some chicken added.
If I left it out, we would still be able to eat them without feeling - or even knowing - something was missing.
I spend £7 on a chicken, we have roast chicken with mashed potato, red cabbage, green beans, say on the first day, and we probably eat about half the chicken between 2 adults and two small children and lots of crispy delicious chicken skin
I then strip every scrap of meat from the bones. I don't keep the bones for stock though, I just throw them away
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Then next day I might cook a big vegetable curry. I'll divide the curry in half, put one half in the fridge and add half of the leftover chicken (so a quarter of the whole chicken) to the other half on the hob.
Then next day I might make a risotto with leeks and add the other half of the leftover chicken.
And next day we might have the other half of the vegetable curry, without any chicken added at all.