There are escalating time limits on incorrect PIN attempts, which is also enforced in hardware by the Secure Enclave in A7 chips and above. This would mean even

There are escalating time limits on incorrect PIN attempts, which is also enforced in hardware by the Secure Enclave in A7 chips and above. This would mean even breaking a 4-digit pin code without that delay being removed would take a long time. Additionally the device may be set to wipe after 10 incorrect attempts. Attempts | Delay 1-4: none 5: 1 minute 6: 5 minutes 7-8: 15 minutes 9: 1 hour Source: https://www.apple.com/business/docs/iOS_Security_Guide.pdf https://www.apple.com/business/docs/iOS_Security_Guide.pdf