How long does high protein (e.g. 80%+) dry cat food last once opened?

I want to buy a large bag of it because of a deal, however it would be redundant if it spoils before it's eaten. Most common cat kibble has cereals, grains, etc. and additives as a large fraction of the recipe, hence it lasts long without perishing. What about the ones without?

Edit: meant to say 80%+ animal ingredients, not 80% protein.

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from Pets https://www.reddit.com/r/Pets/comments/kndv49/how_long_does_high_protein_eg_80_dry_cat_food/