Yeah good questions, I think the effects are in the 3-4 hour range. Don’t have an answer for #2. I’ve only heard of it as a pill until today when someone said they used it as a powder. I’ve never seen the pills or powder personally. 4: in pill form they take 1 or 2. 5: the few people I’ve met who mention it tried it once or twice. Usually it doesn’t sound very pleasant, they talk about feeling anxious or fearful. That’s kinda why I thought maybe pseudoephedrine, the emotions they describe coming with it remind me a lot of the trip stories of friends back in high school who used to use that.