You must really like buprenorphine, Animoe
It depends. After 72 hours, you will definantly get a great, long lasting buzz, especially since(I believe) Bupe is your DOC, or at least the one you maintain on the most.
Will you get "high"??? Probably. But it depends on tolerance, and how big of doses you we're doing before. But for me, 3-4 days without is when my tolerance gets low enough that the first shot of buprenorphine feels like a full agonist. And it lasts at least 12 hours, sometimes longer with a big dose.
However, it loses effectiveness quite rapidly after that. If you can wait almost 24 hours, the second shot feels amazing, too. But by the 3rd or 4th shot, it's effectiveness goes down exponentionally. Seriously, it's like a different drug.
I could answer better with more info, but doing it now should get you what you're looking for. It is worth noting however, that your at a point that opioid tolerance drops rapidly. If you could make it another day or two, it will increase the effects.
But, my advice, in the absence of more detail, is too do it now, 72 hours really is a good "break".
Keep in mind though, if your addicted, you'll never be able to get truly "high" again unless you wait long enough to break the physical dependence, while will take quite a while...
(PS: You IV, right? If not, the above info goes out the window, seriously, sublingual and parenteral buprenorphine are like 2 completely different drugs. Snorting would be about the same, though...)