Homemade almond milk usually last up to 7 days in the freezer and about 2 days in the refrigerator. After that, almond milk starts to smell funky and clump up. You will definitely know when to reach this stage.
This time frame is a guideline, however the almond milk could still be totally fine to drink after those days have passed. The true test is how the almond milk looks and tastes. Once it gets thick, clumps a little, smells off, and tastes sour, it’s time to toss it.