65 bits is incredible amount of entropy. Why do you think that's not enough? I'm using 10 characters passwords of lowercase letters almost everywhere and I think that's absolutely enough.
2 ^ 65 / 20 / 365 / 86400 = 58 494 241 735
I don't think Google would allow you to bruteforce account using 58 billions of attempts per second for 20 years.
2 ^ 65 / 20 / 365 / 86400 = 58 494 241 735
I don't think Google would allow you to bruteforce account using 58 billions of attempts per second for 20 years.