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seventy one Level 6 Level 6 (11,610 points)

I am erasing an external disk using the 7 pass option.   The disk was holding 150 GB.   The estimated time jumps every time I look; it started at 16 hours and is now 1 day and 13 hours.   Is there a rule of thumb calculation as to how long it is likely to take.   Oh, and can I put the machine into sleep mode while it is going on?

Mac OS X (10.6.8)
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