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Work Factor = 2^30 requires 1,000,000,000 operations. This does not mean the number of CPU cycles per second either, instead, it means the number of very complex calculations (not just simple +, -, *, /), each of which could take several seconds or more.
Work Factor = 2^60 requires 1 Million CPUs each capable of performing 1 Million DES decryption operations per second to decrypt the data in 11 or 12 days.
Work Factor = 2^90 requires 1 Billion CPUs each capable of performing 1 Billion DES decryption operations per second to decrypt the data in about 30 years.
Work Factor = 2^120 is infeasible. 1 Trillion DES decryption operations per second is beyond the silicon limits of impossibility. Even if 1 Trillion CPUs each capable of performing this impossible task could be gathered together, it is projected that it would take approximately 30,000 years!!!
Caution: All figures denoted above are logical calculations. A junior high school kid may come up with a new way to cut the above quoted times down to seconds at any time in the future!!!