Breakthru Pain Meds: Based on what docs have told me were when you are managing severe pain and as mentioned above...time-released, that the break thru is a short-acting med meaning that it should help your pain within 30-60 minutes...
Whereas if you were only on a time-released...it could take a longer time and cause you to suffer for no reason. This info is only my opinion and based on my experience. I would add that this may not appy to recreational users.
May all be well and I will stand beside all who wish me to,
your friend, Risky Business