Shouldn't be more tha 2 to 4 days althought it is not usally tested for by normal or extended drug tests. It can be tested for though using a specific test. Also, high doses of K can cause a positive test for PCP but that is usually when testing after a short period of time after a high dosage or a binge.
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It is estimated that the drug ketamine stays in human blood from 2 to 4 days. It is possible that it could be stay a little longer depending on circumstances.
Depending on the dose, and weight of the user a ketamine experience will usually last between 30-90 minutes.