Yeah comparisons are like that... to me, a weird one is methadone. It's supposed to be 4x the strength of morphine but, in 6-8 hours, your morphine is all gone yet the methadone is still holding strong. Plus, after a few days, it builds up in your body. I did the math once and, after like 2 weeks where it maxes out, you have 2x the amount you're taking in your body... considering a 24 hour half life.