This is bogus. After 10 attempts, the iPhone locks the phone and erases the data. There’s no such thing as a 48 year lock out wait to try another passcode.
I had an older iPhone with the 4X child feature.
That is, my child entered the incorrect password 4 times in a row and it erased all my info from the phone: Numbers, photos, et al.
This was before the cloud, which would be a good thing if I was, say, Jennifer Lawrence and had photos of my butt hole on the phone. But I am boring and don’t have any butt hole photos on my phone.