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For starters, I took a look at the 'similar threads' suggestions underneath your post, and it seems like these could be a great starting place to search for information regarding the effects/onset of snorting Adderall :
Swim just took 10mg, only his 2nd or so time doing it, but it lasts about an hour and a half for 10m and up to 2 hours for him with 20 =\ not sure about 50. But swim thinks itll last even longer. Its XR though so it will last longer hopefully!