I'd anticipate 15-30 minutes, unless he takes it on top of food, in which case it may be an hour or more, OR, if taken on top of a fatty meal, you won't. Remember, fats coat medications like Adderall and allow a goodly portion to be passed through the digestive tract unabsorbed.
There is no extended waiting with meds like Adderall, but they also have a window of effectiveness as opposed to drugs which need to build up in the system which eventually maintain treatment 24/7.
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