I assume that's after it's digested, dissolved and absorbed into the blood stream from the stomach. It takes time for pills to dissolve in the stomach.
here is the testimony I was referring to, if it doesn't cue up to the right time it's at 30:53.
Nelson: now in your report you wrote that you would expect the peak respiratory depression to occur from fentanyl within five
minutes of ingestion?
Toobin: Right