How long after a cat or dog has been in a house is it safe to assume all the pet dander has died?

I know that after someone gets rid of their cat/dog it takes time before all the dander is removed from the house and people with allergies can be okay. I was just wondering if anyone knew the exact amount of time?
I mean so it doesn’t affect a person with allergies. I’ve heard 3 months. But I don’t know if it’s accurate.

Hard to say, dander sticks to walls and gets into the carpet and spaces behind things. You need to vacuum and clean every surface and replace any air filtration with allergen filters. Even then it can take awhile.

Crazy Cat Attacking Spuds Dog

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