How long can you use soy milk for after opening it?!

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I've used it after 2 weeks and it just tasted a little different (almost stale or something, but not really bad). It should be fine, just try to finish it off today or tomorrow. 7-10 days is just the time period that it stays freshest. It will stay good a little longer, but I wouldn't push it much more.

Sniff it, and take a teeny, tiny sip. If it smells and tastes okay, it should be alright. If not, dump it and buy a smaller carton next time.

i think the ingredients go bad or something like that because i also get soy milk not regular milk plus it's healthier

You can smell when it goes bad, like regular milk. I'm not sure of the exact amount of days.

That sh;t is spoiled as fu<k, throw it out okay right now.

I've had it after 14 days and it was still OK. It probably depends on how cold you keep your fridge.

about 10 days