What's the maximum number of allowed characters in the passphrase? It says 100 is too much. I don't think my passphrase is 100 but I put that since it's the maximum a Ledger will allow, which is what I used.
Brute-forcing 100 characters will never ever succeed. You'll probably have a very hard time with 10 characters already, if your password is that long your only chance is to remember it. Or at least most of it.