It will never become unrecoverable, but the chances that you're going to lose your data are big. You cannot keep trying it, eventually the iPhone will completely lock you out, and then you will lose all your data (because you dont have a backup) in that process I am afraid
If you want to do that process, these are the instructions:
- From your device's Lock Screen, try to enter your passcode five times until the "[Device] Unavailable" screen appears and your device asks you to try again later.
- When you're able to, continue to enter your passcode until the "Security Lockout" screen appears and you get the Erase [Device] option in the bottom corner of the screen.
- Tap Erase [Device], then tap Erase [Device] again to confirm.
- Enter your Apple ID password to sign out of your Apple ID on your device.
- Tap Erase [Device] to permanently delete all of your data and settings.
- When your device restarts, follow the onscreen instructions to set up your device again, restore your data and settings from a backup, and set a new passcode.
If you can't follow these steps, you can use a computer to reset your device.