How long before I can try to sign into Amazon again?

I'm helping my mom sign into her Amazon account because she hasn't been able to for a while. She couldn't remember what name was associated with her account so after multiple attempts it locked her out. We contacted customer service and figured out what name her account has on it but we can't try to sign in again because of the lock out. I know that it unlocks by itself after a while and allows you to attempt to sign in again because this has happened before but I want to know how long it actually takes. Like 48 hours maybe?

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