Drug info - Concerning the Duration of Various Opiates

[Mulletov]

I was wondering as to the duration of various opiates. If you could list of some opiates and their length of activity I would appreciate it much.

For some reason SWIM is mostly interested in the long acting ones.

[mickenator]

The lenghts that opiates can last in any swimmers body will vary depending on that fishes tolerence and the strenght of the drug. It could say that a substance would last 6 or 8 hours but the swimmer has had a high tolerence or something else that they find that the substance only keeps them going 4.

[Mulletov]

Fer sure. Just considering that some Fentanyl analogues can be super short acting, like 10-15 minutes in duration, and Methadone and the like can be considered long acting.
Strictly speaking, I am referring to the action of the drug itself, not the duration due to release mechanism.