The length of time Lortab stays in an individual's system depends on many variables, including age, metabolism, fluid intake, liver and kidney function, dosage, and other medication consumed. The acetaminophen in Lortab has a half-life of 1.15 to 3 hrs in the blood. Hydrocodone has a half-life of about 4 hours. It is detectable in urine tests for up to three days, depending on other factors. It can be detected in a hair test for up to 90 days. 

https://recoverypartnernetwork.com/drug/opioid/lortab-addiction