How many days do you eat leftovers. my dad thinks leftovers are only good to eat the day you cook it and the day after?

i, however, think thats a waste of time and money. i spend $50 dollars for an intricate meal it better last me from monday-friday. i made lasagana and it cost a ton of money for all of the ingredients and spices. i made it from scratch too. i don't like throwing away food because its a waste of money to me.
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