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How soon do you gain weight and collect fat after you eat a bunch of junk food?

I'm trying to get some weight and I ate two pizzas and some mcdonalds and ice cream in two days, how soon do u think I will gain weight? How much junk food do I have to eat to gain weight and how soon will I gain weight after eating junk food? A few days? A few weeks? Or does it take like a month to process? Thanks.