How long does it take to recover an Apple Account?

You will receive an email with 72 hours that will tell you how much additional time you need to wait. Making an additional request will cancel the previous one. Also review the information provided in this support article where a request will be cancelled.

• If you started your account recovery in Settings, System Settings, or the Apple Support app, you can continue to use that specific device during the account recovery period.
• Regardless of how you started the account recovery request, you should turn off all other devices that are currently signed in with your Apple Account until account recovery is complete. If your Apple Account is in use during your request, your account recovery will be cancelled automatically.
• If you started your account recovery request with iforgot.apple.com through your device’s browser, you should avoid using that device during this period. If possible, turn that device off. Using that device might cancel account recovery.

How to use account recovery when you can’t reset your Apple Account password - Apple Support