This question is not something that we can answer man. Believe me, I almost tried to give you an answer myself, yet I stopped when I realized that anything that I or my colleagues can provided is going to be nothing more than a shot in the dark. We simply do not know about you. So, even though we could potentially help you by trying, we could also kill you in the same vein.
Harm Reduction states at least 12 hours if you're inexperienced. Drugs linger and exert action much longer than most folks assume they do from their subjective stance. This can be a problem. Here's an anecdote to illustrate the differences between folks. The subject a fairly naive ~20 year old. We're in a shooting gallery. He goes into the bathroom to shoot his .1 Heroin. Within seconds, I hear a loud thump and crash. Within maybe, 30-45 seconds, he was completely blue with a bus on the way.
He could easily tolerate a .1 shot typically. I did the same dope and it was nothing special. This was a decade ago when Heroin was Heroin. The issue was, he was kind of sick and took 1mg Clonazepam (Klonopin) around 10:00am by his own admission. He hadn't felt sedated whatsoever (and it's a fairly low dose for a user) since early afternoon.
Well, he took the shot around 11:00pm when everyone got back from Lawrence and he died instantly. Luckily he was revived, but my point is, you're playing with fire in every sense of the term. I'm not trying to scare anyone, but this can, does and has happened.
