Don't the passwords have to be tried one at a time?
Using letters (small plus caps), 10 numbers, and !@# etc you get 26+26+10+10 or 72. A chance hit for one digit is 1/72 or
.014. A 30 digit password would be .0139 raised to power of 30 or 1.9 to the minus 56 {1.9, with decimal moved 56 places to left}.
A trillion is 12 spaces. {1,000,000,000,000}
a 50 digit password would be 1/72 to the power of 50 or 1.36 to the minus 93 {decimal moved left 93 spaces}
The chance of doing this by trial and error [computer] would be
1 of
736,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000, 000,000,000,000,000,000,000
