How many more days can milk last after the expiration date?

I've drunk milk before when it was like 4 days past the date, and nothing happened, though i do have a strong immune system, no I do not know how to "smell" milk lolz, ahahaha but idk really... idk how to tell, so.. what do u think?? my mom says weeks, and the expiration date is just so they won't... show more I've drunk milk before when it was like 4 days past the date, and nothing happened, though i do have a strong immune system, no I do not know how to "smell" milk lolz, ahahaha but idk really... idk how to tell, so.. what do u think?? my mom says weeks, and the expiration date is just so they won't get sued or whatever, plz help me, i dont want a long thing, just lolz like how many? :3 thnx btw im almost 12 so yeahh ahahaha. thnx :D :D
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