It depends on how often you take it. If you only use it once, 2 to 3 days. If you are a heavy user, 2 to 3 weeks.
LORTAB is basically Vicodin, (Tylenol & hydrocodone) that comes in 3...
Drug tests rarely check for hydrophone (vicodin metabolite) so you will be OK unless they do an advanced test.They can detect for 2 to 4 days depending upon usage and metabolism.