It doesnt matter if a person does one line or 1 gram it takes at least 72 hours for it to pass through your body completly!
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Approximately 72 hours (3 days). But you might want to wait 5 or 6 days, just to be safe.
no more than 2 days, probably not even 24 hours
http://www.erowid.org/chemicals/cocaine/cocaine_testing.shtml