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#10
That doesn't sound feasible to me.
For a 20 character password, assuming you are able to use the full mixture of numeric, alphanumeric and special characters on a keyboard, then:
96^20 = 4.42 x 10^39 possibilities
Assuming a single unit capable of 100 trillion guesses a second, then:
4.2 x 10^39 / 100 x 10^13 = 4.42 x 10^13 seconds or 12,277,845,385 hours or 511,576,892 days or 1,401,580 years