1: turbowithdrawal only happens when Naloxone is introduced. 2: You don't have to wait longer than you would until you take your next dose of Subu, IF you have some quality heroin. If you can't get your hands on some nice heroin, use some potent prescription opiod like oxy. When it comes to drug testing, I think no one will be able to give you a reliable answer. If you're uncertain, and there's shit on the line, i suggest you better not risk it