Hello,
What is the length of the password you recommend?
Are the keys generated based on this password?
A password of 12 characters with both upper and lower case should be good enough, I think. Yes, the password is used to generate the master key, which in turn is used to encrypt/decrypt the config file stored in the storage.
I think the master keys are 256 bit?
If so then you can at least says that there is no point in a >256 bit password. So no point in more that ~40 characters for the encryption password.