If this question is in reference to a drug test, your answer would be 3 to 4 days. Hydrocodone exhibits a complex pattern of metabolism including O-demethylation, N-demethylation and 6-keto reduction to the corresponding 6-(alpha)- and 6-(beta)-hydroxymetabolites.egardless of how long you have used hydrocodone, it will only be detected in a urine test for up to 12 to 80 hours. A hair follicle test is good for 6 months. 10 people found this useful. Edit.