I was on suboxone for 8 months straight everyday, and honestly I would say about a total of 40 or 50 of those days I got high after taking the sub, i would take a half or quarter of an 8mg and then at 4 or 5 after work a lot of days I would go get some Roxys and did two or three and was plenty high, I know a lot of people say 24 hours, but I personally find that to be bull, my buddy at work who I gave about half his prescription money (that's how I got the subs, I'd give him 120 each month and id get like twenty, he was getting 60 a month) anyways even he would get blues very rarely and he takes a whole sub and he'd wait till like 6 but he got plenty high also,I guess everyone's body is different, try a small amount out if u feel it, go for more, if not wait. But personally I always felt just as good even if I took a sub earlier. Now on the other hand, DO NOT do oxy or h or whatever and then take subs two or 4 even 8 hours later, but for me I would do a blue at 9 pm, and wake up at 7 for work and take my sub and be fine. Like I said everyone's different